1 /* 2 * Copyright (c) 2002-2003 Luigi Rizzo 3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4 * Copyright (c) 1994 Ugen J.S.Antsilevich 5 * 6 * Idea and grammar partially left from: 7 * Copyright (c) 1993 Daniel Boulet 8 * 9 * Redistribution and use in source forms, with and without modification, 10 * are permitted provided that this entire comment appears intact. 11 * 12 * Redistribution in binary form may occur without any restrictions. 13 * Obviously, it would be nice if you gave credit where credit is due 14 * but requiring it would be too onerous. 15 * 16 * This software is provided ``AS IS'' without any warranties of any kind. 17 * 18 * NEW command line interface for IP firewall facility 19 * 20 * $FreeBSD$ 21 */ 22 23 #include <sys/param.h> 24 #include <sys/mbuf.h> 25 #include <sys/socket.h> 26 #include <sys/sockio.h> 27 #include <sys/sysctl.h> 28 #include <sys/time.h> 29 #include <sys/wait.h> 30 31 #include <ctype.h> 32 #include <err.h> 33 #include <errno.h> 34 #include <grp.h> 35 #include <limits.h> 36 #include <netdb.h> 37 #include <pwd.h> 38 #include <signal.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <stdarg.h> 42 #include <string.h> 43 #include <timeconv.h> /* XXX do we need this ? */ 44 #include <unistd.h> 45 #include <sysexits.h> 46 47 #include <net/if.h> 48 #include <netinet/in.h> 49 #include <netinet/in_systm.h> 50 #include <netinet/ip.h> 51 #include <netinet/ip_icmp.h> 52 #include <netinet/ip_fw.h> 53 #include <net/route.h> /* def. of struct route */ 54 #include <netinet/ip_dummynet.h> 55 #include <netinet/tcp.h> 56 #include <arpa/inet.h> 57 58 int 59 do_resolv, /* Would try to resolve all */ 60 do_time, /* Show time stamps */ 61 do_quiet, /* Be quiet in add and flush */ 62 do_pipe, /* this cmd refers to a pipe */ 63 do_sort, /* field to sort results (0 = no) */ 64 do_dynamic, /* display dynamic rules */ 65 do_expired, /* display expired dynamic rules */ 66 do_compact, /* show rules in compact mode */ 67 show_sets, /* display rule sets */ 68 test_only, /* only check syntax */ 69 verbose; 70 71 #define IP_MASK_ALL 0xffffffff 72 73 /* 74 * _s_x is a structure that stores a string <-> token pairs, used in 75 * various places in the parser. Entries are stored in arrays, 76 * with an entry with s=NULL as terminator. 77 * The search routines are match_token() and match_value(). 78 * Often, an element with x=0 contains an error string. 79 * 80 */ 81 struct _s_x { 82 char const *s; 83 int x; 84 }; 85 86 static struct _s_x f_tcpflags[] = { 87 { "syn", TH_SYN }, 88 { "fin", TH_FIN }, 89 { "ack", TH_ACK }, 90 { "psh", TH_PUSH }, 91 { "rst", TH_RST }, 92 { "urg", TH_URG }, 93 { "tcp flag", 0 }, 94 { NULL, 0 } 95 }; 96 97 static struct _s_x f_tcpopts[] = { 98 { "mss", IP_FW_TCPOPT_MSS }, 99 { "maxseg", IP_FW_TCPOPT_MSS }, 100 { "window", IP_FW_TCPOPT_WINDOW }, 101 { "sack", IP_FW_TCPOPT_SACK }, 102 { "ts", IP_FW_TCPOPT_TS }, 103 { "timestamp", IP_FW_TCPOPT_TS }, 104 { "cc", IP_FW_TCPOPT_CC }, 105 { "tcp option", 0 }, 106 { NULL, 0 } 107 }; 108 109 /* 110 * IP options span the range 0 to 255 so we need to remap them 111 * (though in fact only the low 5 bits are significant). 112 */ 113 static struct _s_x f_ipopts[] = { 114 { "ssrr", IP_FW_IPOPT_SSRR}, 115 { "lsrr", IP_FW_IPOPT_LSRR}, 116 { "rr", IP_FW_IPOPT_RR}, 117 { "ts", IP_FW_IPOPT_TS}, 118 { "ip option", 0 }, 119 { NULL, 0 } 120 }; 121 122 static struct _s_x f_iptos[] = { 123 { "lowdelay", IPTOS_LOWDELAY}, 124 { "throughput", IPTOS_THROUGHPUT}, 125 { "reliability", IPTOS_RELIABILITY}, 126 { "mincost", IPTOS_MINCOST}, 127 { "congestion", IPTOS_CE}, 128 { "ecntransport", IPTOS_ECT}, 129 { "ip tos option", 0}, 130 { NULL, 0 } 131 }; 132 133 static struct _s_x limit_masks[] = { 134 {"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT}, 135 {"src-addr", DYN_SRC_ADDR}, 136 {"src-port", DYN_SRC_PORT}, 137 {"dst-addr", DYN_DST_ADDR}, 138 {"dst-port", DYN_DST_PORT}, 139 {NULL, 0} 140 }; 141 142 /* 143 * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines 144 * This is only used in this code. 145 */ 146 #define IPPROTO_ETHERTYPE 0x1000 147 static struct _s_x ether_types[] = { 148 /* 149 * Note, we cannot use "-:&/" in the names because they are field 150 * separators in the type specifications. Also, we use s = NULL as 151 * end-delimiter, because a type of 0 can be legal. 152 */ 153 { "ip", 0x0800 }, 154 { "ipv4", 0x0800 }, 155 { "ipv6", 0x86dd }, 156 { "arp", 0x0806 }, 157 { "rarp", 0x8035 }, 158 { "vlan", 0x8100 }, 159 { "loop", 0x9000 }, 160 { "trail", 0x1000 }, 161 { "at", 0x809b }, 162 { "atalk", 0x809b }, 163 { "aarp", 0x80f3 }, 164 { "pppoe_disc", 0x8863 }, 165 { "pppoe_sess", 0x8864 }, 166 { "ipx_8022", 0x00E0 }, 167 { "ipx_8023", 0x0000 }, 168 { "ipx_ii", 0x8137 }, 169 { "ipx_snap", 0x8137 }, 170 { "ipx", 0x8137 }, 171 { "ns", 0x0600 }, 172 { NULL, 0 } 173 }; 174 175 static void show_usage(void); 176 177 enum tokens { 178 TOK_NULL=0, 179 180 TOK_OR, 181 TOK_NOT, 182 TOK_STARTBRACE, 183 TOK_ENDBRACE, 184 185 TOK_ACCEPT, 186 TOK_COUNT, 187 TOK_PIPE, 188 TOK_QUEUE, 189 TOK_DIVERT, 190 TOK_TEE, 191 TOK_FORWARD, 192 TOK_SKIPTO, 193 TOK_DENY, 194 TOK_REJECT, 195 TOK_RESET, 196 TOK_UNREACH, 197 TOK_CHECKSTATE, 198 199 TOK_UID, 200 TOK_GID, 201 TOK_IN, 202 TOK_LIMIT, 203 TOK_KEEPSTATE, 204 TOK_LAYER2, 205 TOK_OUT, 206 TOK_XMIT, 207 TOK_RECV, 208 TOK_VIA, 209 TOK_FRAG, 210 TOK_IPOPTS, 211 TOK_IPLEN, 212 TOK_IPID, 213 TOK_IPPRECEDENCE, 214 TOK_IPTOS, 215 TOK_IPTTL, 216 TOK_IPVER, 217 TOK_ESTAB, 218 TOK_SETUP, 219 TOK_TCPFLAGS, 220 TOK_TCPOPTS, 221 TOK_TCPSEQ, 222 TOK_TCPACK, 223 TOK_TCPWIN, 224 TOK_ICMPTYPES, 225 TOK_MAC, 226 TOK_MACTYPE, 227 TOK_VERREVPATH, 228 TOK_IPSEC, 229 TOK_COMMENT, 230 231 TOK_PLR, 232 TOK_NOERROR, 233 TOK_BUCKETS, 234 TOK_DSTIP, 235 TOK_SRCIP, 236 TOK_DSTPORT, 237 TOK_SRCPORT, 238 TOK_ALL, 239 TOK_MASK, 240 TOK_BW, 241 TOK_DELAY, 242 TOK_RED, 243 TOK_GRED, 244 TOK_DROPTAIL, 245 TOK_PROTO, 246 TOK_WEIGHT, 247 }; 248 249 struct _s_x dummynet_params[] = { 250 { "plr", TOK_PLR }, 251 { "noerror", TOK_NOERROR }, 252 { "buckets", TOK_BUCKETS }, 253 { "dst-ip", TOK_DSTIP }, 254 { "src-ip", TOK_SRCIP }, 255 { "dst-port", TOK_DSTPORT }, 256 { "src-port", TOK_SRCPORT }, 257 { "proto", TOK_PROTO }, 258 { "weight", TOK_WEIGHT }, 259 { "all", TOK_ALL }, 260 { "mask", TOK_MASK }, 261 { "droptail", TOK_DROPTAIL }, 262 { "red", TOK_RED }, 263 { "gred", TOK_GRED }, 264 { "bw", TOK_BW }, 265 { "bandwidth", TOK_BW }, 266 { "delay", TOK_DELAY }, 267 { "pipe", TOK_PIPE }, 268 { "queue", TOK_QUEUE }, 269 { "dummynet-params", TOK_NULL }, 270 { NULL, 0 } /* terminator */ 271 }; 272 273 struct _s_x rule_actions[] = { 274 { "accept", TOK_ACCEPT }, 275 { "pass", TOK_ACCEPT }, 276 { "allow", TOK_ACCEPT }, 277 { "permit", TOK_ACCEPT }, 278 { "count", TOK_COUNT }, 279 { "pipe", TOK_PIPE }, 280 { "queue", TOK_QUEUE }, 281 { "divert", TOK_DIVERT }, 282 { "tee", TOK_TEE }, 283 { "fwd", TOK_FORWARD }, 284 { "forward", TOK_FORWARD }, 285 { "skipto", TOK_SKIPTO }, 286 { "deny", TOK_DENY }, 287 { "drop", TOK_DENY }, 288 { "reject", TOK_REJECT }, 289 { "reset", TOK_RESET }, 290 { "unreach", TOK_UNREACH }, 291 { "check-state", TOK_CHECKSTATE }, 292 { "//", TOK_COMMENT }, 293 { NULL, 0 } /* terminator */ 294 }; 295 296 struct _s_x rule_options[] = { 297 { "uid", TOK_UID }, 298 { "gid", TOK_GID }, 299 { "in", TOK_IN }, 300 { "limit", TOK_LIMIT }, 301 { "keep-state", TOK_KEEPSTATE }, 302 { "bridged", TOK_LAYER2 }, 303 { "layer2", TOK_LAYER2 }, 304 { "out", TOK_OUT }, 305 { "xmit", TOK_XMIT }, 306 { "recv", TOK_RECV }, 307 { "via", TOK_VIA }, 308 { "fragment", TOK_FRAG }, 309 { "frag", TOK_FRAG }, 310 { "ipoptions", TOK_IPOPTS }, 311 { "ipopts", TOK_IPOPTS }, 312 { "iplen", TOK_IPLEN }, 313 { "ipid", TOK_IPID }, 314 { "ipprecedence", TOK_IPPRECEDENCE }, 315 { "iptos", TOK_IPTOS }, 316 { "ipttl", TOK_IPTTL }, 317 { "ipversion", TOK_IPVER }, 318 { "ipver", TOK_IPVER }, 319 { "estab", TOK_ESTAB }, 320 { "established", TOK_ESTAB }, 321 { "setup", TOK_SETUP }, 322 { "tcpflags", TOK_TCPFLAGS }, 323 { "tcpflgs", TOK_TCPFLAGS }, 324 { "tcpoptions", TOK_TCPOPTS }, 325 { "tcpopts", TOK_TCPOPTS }, 326 { "tcpseq", TOK_TCPSEQ }, 327 { "tcpack", TOK_TCPACK }, 328 { "tcpwin", TOK_TCPWIN }, 329 { "icmptype", TOK_ICMPTYPES }, 330 { "icmptypes", TOK_ICMPTYPES }, 331 { "dst-ip", TOK_DSTIP }, 332 { "src-ip", TOK_SRCIP }, 333 { "dst-port", TOK_DSTPORT }, 334 { "src-port", TOK_SRCPORT }, 335 { "proto", TOK_PROTO }, 336 { "MAC", TOK_MAC }, 337 { "mac", TOK_MAC }, 338 { "mac-type", TOK_MACTYPE }, 339 { "verrevpath", TOK_VERREVPATH }, 340 { "ipsec", TOK_IPSEC }, 341 { "//", TOK_COMMENT }, 342 343 { "not", TOK_NOT }, /* pseudo option */ 344 { "!", /* escape ? */ TOK_NOT }, /* pseudo option */ 345 { "or", TOK_OR }, /* pseudo option */ 346 { "|", /* escape */ TOK_OR }, /* pseudo option */ 347 { "{", TOK_STARTBRACE }, /* pseudo option */ 348 { "(", TOK_STARTBRACE }, /* pseudo option */ 349 { "}", TOK_ENDBRACE }, /* pseudo option */ 350 { ")", TOK_ENDBRACE }, /* pseudo option */ 351 { NULL, 0 } /* terminator */ 352 }; 353 354 static __inline uint64_t 355 align_uint64(uint64_t *pll) { 356 uint64_t ret; 357 358 bcopy (pll, &ret, sizeof(ret)); 359 return ret; 360 }; 361 362 /* 363 * conditionally runs the command. 364 */ 365 static int 366 do_cmd(int optname, void *optval, uintptr_t optlen) 367 { 368 static int s = -1; /* the socket */ 369 int i; 370 371 if (test_only) 372 return 0; 373 374 if (s == -1) 375 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); 376 if (s < 0) 377 err(EX_UNAVAILABLE, "socket"); 378 379 if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET || 380 optname == IP_FW_ADD) 381 i = getsockopt(s, IPPROTO_IP, optname, optval, 382 (socklen_t *)optlen); 383 else 384 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen); 385 return i; 386 } 387 388 /** 389 * match_token takes a table and a string, returns the value associated 390 * with the string (-1 in case of failure). 391 */ 392 static int 393 match_token(struct _s_x *table, char *string) 394 { 395 struct _s_x *pt; 396 uint i = strlen(string); 397 398 for (pt = table ; i && pt->s != NULL ; pt++) 399 if (strlen(pt->s) == i && !bcmp(string, pt->s, i)) 400 return pt->x; 401 return -1; 402 }; 403 404 /** 405 * match_value takes a table and a value, returns the string associated 406 * with the value (NULL in case of failure). 407 */ 408 static char const * 409 match_value(struct _s_x *p, int value) 410 { 411 for (; p->s != NULL; p++) 412 if (p->x == value) 413 return p->s; 414 return NULL; 415 } 416 417 /* 418 * prints one port, symbolic or numeric 419 */ 420 static void 421 print_port(int proto, uint16_t port) 422 { 423 424 if (proto == IPPROTO_ETHERTYPE) { 425 char const *s; 426 427 if (do_resolv && (s = match_value(ether_types, port)) ) 428 printf("%s", s); 429 else 430 printf("0x%04x", port); 431 } else { 432 struct servent *se = NULL; 433 if (do_resolv) { 434 struct protoent *pe = getprotobynumber(proto); 435 436 se = getservbyport(htons(port), pe ? pe->p_name : NULL); 437 } 438 if (se) 439 printf("%s", se->s_name); 440 else 441 printf("%d", port); 442 } 443 } 444 445 struct _s_x _port_name[] = { 446 {"dst-port", O_IP_DSTPORT}, 447 {"src-port", O_IP_SRCPORT}, 448 {"ipid", O_IPID}, 449 {"iplen", O_IPLEN}, 450 {"ipttl", O_IPTTL}, 451 {"mac-type", O_MAC_TYPE}, 452 {NULL, 0} 453 }; 454 455 /* 456 * Print the values in a list 16-bit items of the types above. 457 * XXX todo: add support for mask. 458 */ 459 static void 460 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode) 461 { 462 uint16_t *p = cmd->ports; 463 int i; 464 char const *sep; 465 466 if (cmd->o.len & F_NOT) 467 printf(" not"); 468 if (opcode != 0) { 469 sep = match_value(_port_name, opcode); 470 if (sep == NULL) 471 sep = "???"; 472 printf (" %s", sep); 473 } 474 sep = " "; 475 for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) { 476 printf(sep); 477 print_port(proto, p[0]); 478 if (p[0] != p[1]) { 479 printf("-"); 480 print_port(proto, p[1]); 481 } 482 sep = ","; 483 } 484 } 485 486 /* 487 * Like strtol, but also translates service names into port numbers 488 * for some protocols. 489 * In particular: 490 * proto == -1 disables the protocol check; 491 * proto == IPPROTO_ETHERTYPE looks up an internal table 492 * proto == <some value in /etc/protocols> matches the values there. 493 * Returns *end == s in case the parameter is not found. 494 */ 495 static int 496 strtoport(char *s, char **end, int base, int proto) 497 { 498 char *p, *buf; 499 char *s1; 500 int i; 501 502 *end = s; /* default - not found */ 503 if (*s == '\0') 504 return 0; /* not found */ 505 506 if (isdigit(*s)) 507 return strtol(s, end, base); 508 509 /* 510 * find separator. '\\' escapes the next char. 511 */ 512 for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++) 513 if (*s1 == '\\' && s1[1] != '\0') 514 s1++; 515 516 buf = malloc(s1 - s + 1); 517 if (buf == NULL) 518 return 0; 519 520 /* 521 * copy into a buffer skipping backslashes 522 */ 523 for (p = s, i = 0; p != s1 ; p++) 524 if (*p != '\\') 525 buf[i++] = *p; 526 buf[i++] = '\0'; 527 528 if (proto == IPPROTO_ETHERTYPE) { 529 i = match_token(ether_types, buf); 530 free(buf); 531 if (i != -1) { /* found */ 532 *end = s1; 533 return i; 534 } 535 } else { 536 struct protoent *pe = NULL; 537 struct servent *se; 538 539 if (proto != 0) 540 pe = getprotobynumber(proto); 541 setservent(1); 542 se = getservbyname(buf, pe ? pe->p_name : NULL); 543 free(buf); 544 if (se != NULL) { 545 *end = s1; 546 return ntohs(se->s_port); 547 } 548 } 549 return 0; /* not found */ 550 } 551 552 /* 553 * Fill the body of the command with the list of port ranges. 554 */ 555 static int 556 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto) 557 { 558 uint16_t a, b, *p = cmd->ports; 559 int i = 0; 560 char *s = av; 561 562 while (*s) { 563 a = strtoport(av, &s, 0, proto); 564 if (s == av) /* no parameter */ 565 break; 566 if (*s == '-') { /* a range */ 567 av = s+1; 568 b = strtoport(av, &s, 0, proto); 569 if (s == av) /* no parameter */ 570 break; 571 p[0] = a; 572 p[1] = b; 573 } else if (*s == ',' || *s == '\0' ) 574 p[0] = p[1] = a; 575 else /* invalid separator */ 576 errx(EX_DATAERR, "invalid separator <%c> in <%s>\n", 577 *s, av); 578 i++; 579 p += 2; 580 av = s+1; 581 } 582 if (i > 0) { 583 if (i+1 > F_LEN_MASK) 584 errx(EX_DATAERR, "too many ports/ranges\n"); 585 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */ 586 } 587 return i; 588 } 589 590 static struct _s_x icmpcodes[] = { 591 { "net", ICMP_UNREACH_NET }, 592 { "host", ICMP_UNREACH_HOST }, 593 { "protocol", ICMP_UNREACH_PROTOCOL }, 594 { "port", ICMP_UNREACH_PORT }, 595 { "needfrag", ICMP_UNREACH_NEEDFRAG }, 596 { "srcfail", ICMP_UNREACH_SRCFAIL }, 597 { "net-unknown", ICMP_UNREACH_NET_UNKNOWN }, 598 { "host-unknown", ICMP_UNREACH_HOST_UNKNOWN }, 599 { "isolated", ICMP_UNREACH_ISOLATED }, 600 { "net-prohib", ICMP_UNREACH_NET_PROHIB }, 601 { "host-prohib", ICMP_UNREACH_HOST_PROHIB }, 602 { "tosnet", ICMP_UNREACH_TOSNET }, 603 { "toshost", ICMP_UNREACH_TOSHOST }, 604 { "filter-prohib", ICMP_UNREACH_FILTER_PROHIB }, 605 { "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE }, 606 { "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF }, 607 { NULL, 0 } 608 }; 609 610 static void 611 fill_reject_code(u_short *codep, char *str) 612 { 613 int val; 614 char *s; 615 616 val = strtoul(str, &s, 0); 617 if (s == str || *s != '\0' || val >= 0x100) 618 val = match_token(icmpcodes, str); 619 if (val < 0) 620 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str); 621 *codep = val; 622 return; 623 } 624 625 static void 626 print_reject_code(uint16_t code) 627 { 628 char const *s = match_value(icmpcodes, code); 629 630 if (s != NULL) 631 printf("unreach %s", s); 632 else 633 printf("unreach %u", code); 634 } 635 636 /* 637 * Returns the number of bits set (from left) in a contiguous bitmask, 638 * or -1 if the mask is not contiguous. 639 * XXX this needs a proper fix. 640 * This effectively works on masks in big-endian (network) format. 641 * when compiled on little endian architectures. 642 * 643 * First bit is bit 7 of the first byte -- note, for MAC addresses, 644 * the first bit on the wire is bit 0 of the first byte. 645 * len is the max length in bits. 646 */ 647 static int 648 contigmask(uint8_t *p, int len) 649 { 650 int i, n; 651 652 for (i=0; i<len ; i++) 653 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */ 654 break; 655 for (n=i+1; n < len; n++) 656 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0) 657 return -1; /* mask not contiguous */ 658 return i; 659 } 660 661 /* 662 * print flags set/clear in the two bitmasks passed as parameters. 663 * There is a specialized check for f_tcpflags. 664 */ 665 static void 666 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list) 667 { 668 char const *comma = ""; 669 int i; 670 uint8_t set = cmd->arg1 & 0xff; 671 uint8_t clear = (cmd->arg1 >> 8) & 0xff; 672 673 if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) { 674 printf(" setup"); 675 return; 676 } 677 678 printf(" %s ", name); 679 for (i=0; list[i].x != 0; i++) { 680 if (set & list[i].x) { 681 set &= ~list[i].x; 682 printf("%s%s", comma, list[i].s); 683 comma = ","; 684 } 685 if (clear & list[i].x) { 686 clear &= ~list[i].x; 687 printf("%s!%s", comma, list[i].s); 688 comma = ","; 689 } 690 } 691 } 692 693 /* 694 * Print the ip address contained in a command. 695 */ 696 static void 697 print_ip(ipfw_insn_ip *cmd, char const *s) 698 { 699 struct hostent *he = NULL; 700 int len = F_LEN((ipfw_insn *)cmd); 701 uint32_t *a = ((ipfw_insn_u32 *)cmd)->d; 702 703 printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 704 705 if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) { 706 printf("me"); 707 return; 708 } 709 if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) { 710 uint32_t x, *map = (uint32_t *)&(cmd->mask); 711 int i, j; 712 char comma = '{'; 713 714 x = cmd->o.arg1 - 1; 715 x = htonl( ~x ); 716 cmd->addr.s_addr = htonl(cmd->addr.s_addr); 717 printf("%s/%d", inet_ntoa(cmd->addr), 718 contigmask((uint8_t *)&x, 32)); 719 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr); 720 x &= 0xff; /* base */ 721 /* 722 * Print bits and ranges. 723 * Locate first bit set (i), then locate first bit unset (j). 724 * If we have 3+ consecutive bits set, then print them as a 725 * range, otherwise only print the initial bit and rescan. 726 */ 727 for (i=0; i < cmd->o.arg1; i++) 728 if (map[i/32] & (1<<(i & 31))) { 729 for (j=i+1; j < cmd->o.arg1; j++) 730 if (!(map[ j/32] & (1<<(j & 31)))) 731 break; 732 printf("%c%d", comma, i+x); 733 if (j>i+2) { /* range has at least 3 elements */ 734 printf("-%d", j-1+x); 735 i = j-1; 736 } 737 comma = ','; 738 } 739 printf("}"); 740 return; 741 } 742 /* 743 * len == 2 indicates a single IP, whereas lists of 1 or more 744 * addr/mask pairs have len = (2n+1). We convert len to n so we 745 * use that to count the number of entries. 746 */ 747 for (len = len / 2; len > 0; len--, a += 2) { 748 int mb = /* mask length */ 749 (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ? 750 32 : contigmask((uint8_t *)&(a[1]), 32); 751 if (mb == 32 && do_resolv) 752 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET); 753 if (he != NULL) /* resolved to name */ 754 printf("%s", he->h_name); 755 else if (mb == 0) /* any */ 756 printf("any"); 757 else { /* numeric IP followed by some kind of mask */ 758 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) ); 759 if (mb < 0) 760 printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) ); 761 else if (mb < 32) 762 printf("/%d", mb); 763 } 764 if (len > 1) 765 printf(","); 766 } 767 } 768 769 /* 770 * prints a MAC address/mask pair 771 */ 772 static void 773 print_mac(uint8_t *addr, uint8_t *mask) 774 { 775 int l = contigmask(mask, 48); 776 777 if (l == 0) 778 printf(" any"); 779 else { 780 printf(" %02x:%02x:%02x:%02x:%02x:%02x", 781 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 782 if (l == -1) 783 printf("&%02x:%02x:%02x:%02x:%02x:%02x", 784 mask[0], mask[1], mask[2], 785 mask[3], mask[4], mask[5]); 786 else if (l < 48) 787 printf("/%d", l); 788 } 789 } 790 791 static void 792 fill_icmptypes(ipfw_insn_u32 *cmd, char *av) 793 { 794 uint8_t type; 795 796 cmd->d[0] = 0; 797 while (*av) { 798 if (*av == ',') 799 av++; 800 801 type = strtoul(av, &av, 0); 802 803 if (*av != ',' && *av != '\0') 804 errx(EX_DATAERR, "invalid ICMP type"); 805 806 if (type > 31) 807 errx(EX_DATAERR, "ICMP type out of range"); 808 809 cmd->d[0] |= 1 << type; 810 } 811 cmd->o.opcode = O_ICMPTYPE; 812 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 813 } 814 815 static void 816 print_icmptypes(ipfw_insn_u32 *cmd) 817 { 818 int i; 819 char sep= ' '; 820 821 printf(" icmptypes"); 822 for (i = 0; i < 32; i++) { 823 if ( (cmd->d[0] & (1 << (i))) == 0) 824 continue; 825 printf("%c%d", sep, i); 826 sep = ','; 827 } 828 } 829 830 /* 831 * show_ipfw() prints the body of an ipfw rule. 832 * Because the standard rule has at least proto src_ip dst_ip, we use 833 * a helper function to produce these entries if not provided explicitly. 834 * The first argument is the list of fields we have, the second is 835 * the list of fields we want to be printed. 836 * 837 * Special cases if we have provided a MAC header: 838 * + if the rule does not contain IP addresses/ports, do not print them; 839 * + if the rule does not contain an IP proto, print "all" instead of "ip"; 840 * 841 * Once we have 'have_options', IP header fields are printed as options. 842 */ 843 #define HAVE_PROTO 0x0001 844 #define HAVE_SRCIP 0x0002 845 #define HAVE_DSTIP 0x0004 846 #define HAVE_MAC 0x0008 847 #define HAVE_MACTYPE 0x0010 848 #define HAVE_OPTIONS 0x8000 849 850 #define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP) 851 static void 852 show_prerequisites(int *flags, int want, int cmd) 853 { 854 if ( (*flags & HAVE_IP) == HAVE_IP) 855 *flags |= HAVE_OPTIONS; 856 857 if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC && 858 cmd != O_MAC_TYPE) { 859 /* 860 * mac-type was optimized out by the compiler, 861 * restore it 862 */ 863 printf(" any"); 864 *flags |= HAVE_MACTYPE | HAVE_OPTIONS; 865 return; 866 } 867 if ( !(*flags & HAVE_OPTIONS)) { 868 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) 869 printf(" ip"); 870 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP)) 871 printf(" from any"); 872 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP)) 873 printf(" to any"); 874 } 875 *flags |= want; 876 } 877 878 static void 879 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth) 880 { 881 static int twidth = 0; 882 int l; 883 ipfw_insn *cmd; 884 char *comment = NULL; /* ptr to comment if we have one */ 885 int proto = 0; /* default */ 886 int flags = 0; /* prerequisites */ 887 ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */ 888 int or_block = 0; /* we are in an or block */ 889 uint32_t set_disable; 890 891 bcopy(&rule->next_rule, &set_disable, sizeof(set_disable)); 892 893 if (set_disable & (1 << rule->set)) { /* disabled */ 894 if (!show_sets) 895 return; 896 else 897 printf("# DISABLED "); 898 } 899 printf("%05u ", rule->rulenum); 900 901 if (pcwidth>0 || bcwidth>0) 902 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt), 903 bcwidth, align_uint64(&rule->bcnt)); 904 905 if (do_time == 2) 906 printf("%10u ", rule->timestamp); 907 else if (do_time == 1) { 908 char timestr[30]; 909 time_t t = (time_t)0; 910 911 if (twidth == 0) { 912 strcpy(timestr, ctime(&t)); 913 *strchr(timestr, '\n') = '\0'; 914 twidth = strlen(timestr); 915 } 916 if (rule->timestamp) { 917 #if _FreeBSD_version < 500000 /* XXX check */ 918 #define _long_to_time(x) (time_t)(x) 919 #endif 920 t = _long_to_time(rule->timestamp); 921 922 strcpy(timestr, ctime(&t)); 923 *strchr(timestr, '\n') = '\0'; 924 printf("%s ", timestr); 925 } else { 926 printf("%*s", twidth, " "); 927 } 928 } 929 930 if (show_sets) 931 printf("set %d ", rule->set); 932 933 /* 934 * print the optional "match probability" 935 */ 936 if (rule->cmd_len > 0) { 937 cmd = rule->cmd ; 938 if (cmd->opcode == O_PROB) { 939 ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd; 940 double d = 1.0 * p->d[0]; 941 942 d = (d / 0x7fffffff); 943 printf("prob %f ", d); 944 } 945 } 946 947 /* 948 * first print actions 949 */ 950 for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule); 951 l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) { 952 switch(cmd->opcode) { 953 case O_CHECK_STATE: 954 printf("check-state"); 955 flags = HAVE_IP; /* avoid printing anything else */ 956 break; 957 958 case O_ACCEPT: 959 printf("allow"); 960 break; 961 962 case O_COUNT: 963 printf("count"); 964 break; 965 966 case O_DENY: 967 printf("deny"); 968 break; 969 970 case O_REJECT: 971 if (cmd->arg1 == ICMP_REJECT_RST) 972 printf("reset"); 973 else if (cmd->arg1 == ICMP_UNREACH_HOST) 974 printf("reject"); 975 else 976 print_reject_code(cmd->arg1); 977 break; 978 979 case O_SKIPTO: 980 printf("skipto %u", cmd->arg1); 981 break; 982 983 case O_PIPE: 984 printf("pipe %u", cmd->arg1); 985 break; 986 987 case O_QUEUE: 988 printf("queue %u", cmd->arg1); 989 break; 990 991 case O_DIVERT: 992 printf("divert %u", cmd->arg1); 993 break; 994 995 case O_TEE: 996 printf("tee %u", cmd->arg1); 997 break; 998 999 case O_FORWARD_IP: 1000 { 1001 ipfw_insn_sa *s = (ipfw_insn_sa *)cmd; 1002 1003 printf("fwd %s", inet_ntoa(s->sa.sin_addr)); 1004 if (s->sa.sin_port) 1005 printf(",%d", s->sa.sin_port); 1006 } 1007 break; 1008 1009 case O_LOG: /* O_LOG is printed last */ 1010 logptr = (ipfw_insn_log *)cmd; 1011 break; 1012 1013 default: 1014 printf("** unrecognized action %d len %d", 1015 cmd->opcode, cmd->len); 1016 } 1017 } 1018 if (logptr) { 1019 if (logptr->max_log > 0) 1020 printf(" log logamount %d", logptr->max_log); 1021 else 1022 printf(" log"); 1023 } 1024 1025 /* 1026 * then print the body. 1027 */ 1028 if (rule->_pad & 1) { /* empty rules before options */ 1029 if (!do_compact) 1030 printf(" ip from any to any"); 1031 flags |= HAVE_IP | HAVE_OPTIONS; 1032 } 1033 1034 for (l = rule->act_ofs, cmd = rule->cmd ; 1035 l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) { 1036 /* useful alias */ 1037 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; 1038 1039 show_prerequisites(&flags, 0, cmd->opcode); 1040 1041 switch(cmd->opcode) { 1042 case O_PROB: 1043 break; /* done already */ 1044 1045 case O_PROBE_STATE: 1046 break; /* no need to print anything here */ 1047 1048 case O_MACADDR2: { 1049 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd; 1050 1051 if ((cmd->len & F_OR) && !or_block) 1052 printf(" {"); 1053 if (cmd->len & F_NOT) 1054 printf(" not"); 1055 printf(" MAC"); 1056 flags |= HAVE_MAC; 1057 print_mac(m->addr, m->mask); 1058 print_mac(m->addr + 6, m->mask + 6); 1059 } 1060 break; 1061 1062 case O_MAC_TYPE: 1063 if ((cmd->len & F_OR) && !or_block) 1064 printf(" {"); 1065 print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE, 1066 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1067 flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS; 1068 break; 1069 1070 case O_IP_SRC: 1071 case O_IP_SRC_MASK: 1072 case O_IP_SRC_ME: 1073 case O_IP_SRC_SET: 1074 show_prerequisites(&flags, HAVE_PROTO, 0); 1075 if (!(flags & HAVE_SRCIP)) 1076 printf(" from"); 1077 if ((cmd->len & F_OR) && !or_block) 1078 printf(" {"); 1079 print_ip((ipfw_insn_ip *)cmd, 1080 (flags & HAVE_OPTIONS) ? " src-ip" : ""); 1081 flags |= HAVE_SRCIP; 1082 break; 1083 1084 case O_IP_DST: 1085 case O_IP_DST_MASK: 1086 case O_IP_DST_ME: 1087 case O_IP_DST_SET: 1088 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1089 if (!(flags & HAVE_DSTIP)) 1090 printf(" to"); 1091 if ((cmd->len & F_OR) && !or_block) 1092 printf(" {"); 1093 print_ip((ipfw_insn_ip *)cmd, 1094 (flags & HAVE_OPTIONS) ? " dst-ip" : ""); 1095 flags |= HAVE_DSTIP; 1096 break; 1097 1098 case O_IP_DSTPORT: 1099 show_prerequisites(&flags, HAVE_IP, 0); 1100 case O_IP_SRCPORT: 1101 show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0); 1102 if ((cmd->len & F_OR) && !or_block) 1103 printf(" {"); 1104 print_newports((ipfw_insn_u16 *)cmd, proto, 1105 (flags & HAVE_OPTIONS) ? cmd->opcode : 0); 1106 break; 1107 1108 case O_PROTO: { 1109 struct protoent *pe; 1110 1111 if ((cmd->len & F_OR) && !or_block) 1112 printf(" {"); 1113 if (cmd->len & F_NOT) 1114 printf(" not"); 1115 proto = cmd->arg1; 1116 pe = getprotobynumber(cmd->arg1); 1117 if (flags & HAVE_OPTIONS) 1118 printf(" proto"); 1119 if (pe) 1120 printf(" %s", pe->p_name); 1121 else 1122 printf(" %u", cmd->arg1); 1123 } 1124 flags |= HAVE_PROTO; 1125 break; 1126 1127 default: /*options ... */ 1128 show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0); 1129 if ((cmd->len & F_OR) && !or_block) 1130 printf(" {"); 1131 if (cmd->len & F_NOT && cmd->opcode != O_IN) 1132 printf(" not"); 1133 switch(cmd->opcode) { 1134 case O_FRAG: 1135 printf(" frag"); 1136 break; 1137 1138 case O_IN: 1139 printf(cmd->len & F_NOT ? " out" : " in"); 1140 break; 1141 1142 case O_LAYER2: 1143 printf(" layer2"); 1144 break; 1145 case O_XMIT: 1146 case O_RECV: 1147 case O_VIA: { 1148 char const *s; 1149 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd; 1150 1151 if (cmd->opcode == O_XMIT) 1152 s = "xmit"; 1153 else if (cmd->opcode == O_RECV) 1154 s = "recv"; 1155 else /* if (cmd->opcode == O_VIA) */ 1156 s = "via"; 1157 if (cmdif->name[0] == '\0') 1158 printf(" %s %s", s, 1159 inet_ntoa(cmdif->p.ip)); 1160 else if (cmdif->p.unit == -1) 1161 printf(" %s %s*", s, cmdif->name); 1162 else 1163 printf(" %s %s%d", s, cmdif->name, 1164 cmdif->p.unit); 1165 } 1166 break; 1167 1168 case O_IPID: 1169 if (F_LEN(cmd) == 1) 1170 printf(" ipid %u", cmd->arg1 ); 1171 else 1172 print_newports((ipfw_insn_u16 *)cmd, 0, 1173 O_IPID); 1174 break; 1175 1176 case O_IPTTL: 1177 if (F_LEN(cmd) == 1) 1178 printf(" ipttl %u", cmd->arg1 ); 1179 else 1180 print_newports((ipfw_insn_u16 *)cmd, 0, 1181 O_IPTTL); 1182 break; 1183 1184 case O_IPVER: 1185 printf(" ipver %u", cmd->arg1 ); 1186 break; 1187 1188 case O_IPPRECEDENCE: 1189 printf(" ipprecedence %u", (cmd->arg1) >> 5 ); 1190 break; 1191 1192 case O_IPLEN: 1193 if (F_LEN(cmd) == 1) 1194 printf(" iplen %u", cmd->arg1 ); 1195 else 1196 print_newports((ipfw_insn_u16 *)cmd, 0, 1197 O_IPLEN); 1198 break; 1199 1200 case O_IPOPT: 1201 print_flags("ipoptions", cmd, f_ipopts); 1202 break; 1203 1204 case O_IPTOS: 1205 print_flags("iptos", cmd, f_iptos); 1206 break; 1207 1208 case O_ICMPTYPE: 1209 print_icmptypes((ipfw_insn_u32 *)cmd); 1210 break; 1211 1212 case O_ESTAB: 1213 printf(" established"); 1214 break; 1215 1216 case O_TCPFLAGS: 1217 print_flags("tcpflags", cmd, f_tcpflags); 1218 break; 1219 1220 case O_TCPOPTS: 1221 print_flags("tcpoptions", cmd, f_tcpopts); 1222 break; 1223 1224 case O_TCPWIN: 1225 printf(" tcpwin %d", ntohs(cmd->arg1)); 1226 break; 1227 1228 case O_TCPACK: 1229 printf(" tcpack %d", ntohl(cmd32->d[0])); 1230 break; 1231 1232 case O_TCPSEQ: 1233 printf(" tcpseq %d", ntohl(cmd32->d[0])); 1234 break; 1235 1236 case O_UID: 1237 { 1238 struct passwd *pwd = getpwuid(cmd32->d[0]); 1239 1240 if (pwd) 1241 printf(" uid %s", pwd->pw_name); 1242 else 1243 printf(" uid %u", cmd32->d[0]); 1244 } 1245 break; 1246 1247 case O_GID: 1248 { 1249 struct group *grp = getgrgid(cmd32->d[0]); 1250 1251 if (grp) 1252 printf(" gid %s", grp->gr_name); 1253 else 1254 printf(" gid %u", cmd32->d[0]); 1255 } 1256 break; 1257 1258 case O_VERREVPATH: 1259 printf(" verrevpath"); 1260 break; 1261 1262 case O_IPSEC: 1263 printf(" ipsec"); 1264 break; 1265 1266 case O_NOP: 1267 comment = (char *)(cmd + 1); 1268 break; 1269 1270 case O_KEEP_STATE: 1271 printf(" keep-state"); 1272 break; 1273 1274 case O_LIMIT: 1275 { 1276 struct _s_x *p = limit_masks; 1277 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 1278 uint8_t x = c->limit_mask; 1279 char const *comma = " "; 1280 1281 printf(" limit"); 1282 for (; p->x != 0 ; p++) 1283 if ((x & p->x) == p->x) { 1284 x &= ~p->x; 1285 printf("%s%s", comma, p->s); 1286 comma = ","; 1287 } 1288 printf(" %d", c->conn_limit); 1289 } 1290 break; 1291 1292 default: 1293 printf(" [opcode %d len %d]", 1294 cmd->opcode, cmd->len); 1295 } 1296 } 1297 if (cmd->len & F_OR) { 1298 printf(" or"); 1299 or_block = 1; 1300 } else if (or_block) { 1301 printf(" }"); 1302 or_block = 0; 1303 } 1304 } 1305 show_prerequisites(&flags, HAVE_IP, 0); 1306 if (comment) 1307 printf(" // %s", comment); 1308 printf("\n"); 1309 } 1310 1311 static void 1312 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth) 1313 { 1314 struct protoent *pe; 1315 struct in_addr a; 1316 uint16_t rulenum; 1317 1318 if (!do_expired) { 1319 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT)) 1320 return; 1321 } 1322 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1323 printf("%05d", rulenum); 1324 if (pcwidth>0 || bcwidth>0) 1325 printf(" %*llu %*llu (%ds)", pcwidth, 1326 align_uint64(&d->pcnt), bcwidth, 1327 align_uint64(&d->bcnt), d->expire); 1328 switch (d->dyn_type) { 1329 case O_LIMIT_PARENT: 1330 printf(" PARENT %d", d->count); 1331 break; 1332 case O_LIMIT: 1333 printf(" LIMIT"); 1334 break; 1335 case O_KEEP_STATE: /* bidir, no mask */ 1336 printf(" STATE"); 1337 break; 1338 } 1339 1340 if ((pe = getprotobynumber(d->id.proto)) != NULL) 1341 printf(" %s", pe->p_name); 1342 else 1343 printf(" proto %u", d->id.proto); 1344 1345 a.s_addr = htonl(d->id.src_ip); 1346 printf(" %s %d", inet_ntoa(a), d->id.src_port); 1347 1348 a.s_addr = htonl(d->id.dst_ip); 1349 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port); 1350 printf("\n"); 1351 } 1352 1353 static int 1354 sort_q(const void *pa, const void *pb) 1355 { 1356 int rev = (do_sort < 0); 1357 int field = rev ? -do_sort : do_sort; 1358 long long res = 0; 1359 const struct dn_flow_queue *a = pa; 1360 const struct dn_flow_queue *b = pb; 1361 1362 switch (field) { 1363 case 1: /* pkts */ 1364 res = a->len - b->len; 1365 break; 1366 case 2: /* bytes */ 1367 res = a->len_bytes - b->len_bytes; 1368 break; 1369 1370 case 3: /* tot pkts */ 1371 res = a->tot_pkts - b->tot_pkts; 1372 break; 1373 1374 case 4: /* tot bytes */ 1375 res = a->tot_bytes - b->tot_bytes; 1376 break; 1377 } 1378 if (res < 0) 1379 res = -1; 1380 if (res > 0) 1381 res = 1; 1382 return (int)(rev ? res : -res); 1383 } 1384 1385 static void 1386 list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q) 1387 { 1388 int l; 1389 1390 printf(" mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n", 1391 fs->flow_mask.proto, 1392 fs->flow_mask.src_ip, fs->flow_mask.src_port, 1393 fs->flow_mask.dst_ip, fs->flow_mask.dst_port); 1394 if (fs->rq_elements == 0) 1395 return; 1396 1397 printf("BKT Prot ___Source IP/port____ " 1398 "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n"); 1399 if (do_sort != 0) 1400 heapsort(q, fs->rq_elements, sizeof *q, sort_q); 1401 for (l = 0; l < fs->rq_elements; l++) { 1402 struct in_addr ina; 1403 struct protoent *pe; 1404 1405 ina.s_addr = htonl(q[l].id.src_ip); 1406 printf("%3d ", q[l].hash_slot); 1407 pe = getprotobynumber(q[l].id.proto); 1408 if (pe) 1409 printf("%-4s ", pe->p_name); 1410 else 1411 printf("%4u ", q[l].id.proto); 1412 printf("%15s/%-5d ", 1413 inet_ntoa(ina), q[l].id.src_port); 1414 ina.s_addr = htonl(q[l].id.dst_ip); 1415 printf("%15s/%-5d ", 1416 inet_ntoa(ina), q[l].id.dst_port); 1417 printf("%4qu %8qu %2u %4u %3u\n", 1418 q[l].tot_pkts, q[l].tot_bytes, 1419 q[l].len, q[l].len_bytes, q[l].drops); 1420 if (verbose) 1421 printf(" S %20qd F %20qd\n", 1422 q[l].S, q[l].F); 1423 } 1424 } 1425 1426 static void 1427 print_flowset_parms(struct dn_flow_set *fs, char *prefix) 1428 { 1429 int l; 1430 char qs[30]; 1431 char plr[30]; 1432 char red[90]; /* Display RED parameters */ 1433 1434 l = fs->qsize; 1435 if (fs->flags_fs & DN_QSIZE_IS_BYTES) { 1436 if (l >= 8192) 1437 sprintf(qs, "%d KB", l / 1024); 1438 else 1439 sprintf(qs, "%d B", l); 1440 } else 1441 sprintf(qs, "%3d sl.", l); 1442 if (fs->plr) 1443 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff)); 1444 else 1445 plr[0] = '\0'; 1446 if (fs->flags_fs & DN_IS_RED) /* RED parameters */ 1447 sprintf(red, 1448 "\n\t %cRED w_q %f min_th %d max_th %d max_p %f", 1449 (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ', 1450 1.0 * fs->w_q / (double)(1 << SCALE_RED), 1451 SCALE_VAL(fs->min_th), 1452 SCALE_VAL(fs->max_th), 1453 1.0 * fs->max_p / (double)(1 << SCALE_RED)); 1454 else 1455 sprintf(red, "droptail"); 1456 1457 printf("%s %s%s %d queues (%d buckets) %s\n", 1458 prefix, qs, plr, fs->rq_elements, fs->rq_size, red); 1459 } 1460 1461 static void 1462 list_pipes(void *data, uint nbytes, int ac, char *av[]) 1463 { 1464 int rulenum; 1465 void *next = data; 1466 struct dn_pipe *p = (struct dn_pipe *) data; 1467 struct dn_flow_set *fs; 1468 struct dn_flow_queue *q; 1469 int l; 1470 1471 if (ac > 0) 1472 rulenum = strtoul(*av++, NULL, 10); 1473 else 1474 rulenum = 0; 1475 for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) { 1476 double b = p->bandwidth; 1477 char buf[30]; 1478 char prefix[80]; 1479 1480 if (p->next != (struct dn_pipe *)DN_IS_PIPE) 1481 break; /* done with pipes, now queues */ 1482 1483 /* 1484 * compute length, as pipe have variable size 1485 */ 1486 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q); 1487 next = (char *)p + l; 1488 nbytes -= l; 1489 1490 if (rulenum != 0 && rulenum != p->pipe_nr) 1491 continue; 1492 1493 /* 1494 * Print rate (or clocking interface) 1495 */ 1496 if (p->if_name[0] != '\0') 1497 sprintf(buf, "%s", p->if_name); 1498 else if (b == 0) 1499 sprintf(buf, "unlimited"); 1500 else if (b >= 1000000) 1501 sprintf(buf, "%7.3f Mbit/s", b/1000000); 1502 else if (b >= 1000) 1503 sprintf(buf, "%7.3f Kbit/s", b/1000); 1504 else 1505 sprintf(buf, "%7.3f bit/s ", b); 1506 1507 sprintf(prefix, "%05d: %s %4d ms ", 1508 p->pipe_nr, buf, p->delay); 1509 print_flowset_parms(&(p->fs), prefix); 1510 if (verbose) 1511 printf(" V %20qd\n", p->V >> MY_M); 1512 1513 q = (struct dn_flow_queue *)(p+1); 1514 list_queues(&(p->fs), q); 1515 } 1516 for (fs = next; nbytes >= sizeof *fs; fs = next) { 1517 char prefix[80]; 1518 1519 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE) 1520 break; 1521 l = sizeof(*fs) + fs->rq_elements * sizeof(*q); 1522 next = (char *)fs + l; 1523 nbytes -= l; 1524 q = (struct dn_flow_queue *)(fs+1); 1525 sprintf(prefix, "q%05d: weight %d pipe %d ", 1526 fs->fs_nr, fs->weight, fs->parent_nr); 1527 print_flowset_parms(fs, prefix); 1528 list_queues(fs, q); 1529 } 1530 } 1531 1532 /* 1533 * This one handles all set-related commands 1534 * ipfw set { show | enable | disable } 1535 * ipfw set swap X Y 1536 * ipfw set move X to Y 1537 * ipfw set move rule X to Y 1538 */ 1539 static void 1540 sets_handler(int ac, char *av[]) 1541 { 1542 uint32_t set_disable, masks[2]; 1543 int i, nbytes; 1544 uint16_t rulenum; 1545 uint8_t cmd, new_set; 1546 1547 ac--; 1548 av++; 1549 1550 if (!ac) 1551 errx(EX_USAGE, "set needs command"); 1552 if (!strncmp(*av, "show", strlen(*av)) ) { 1553 void *data; 1554 char const *msg; 1555 1556 nbytes = sizeof(struct ip_fw); 1557 if ((data = calloc(1, nbytes)) == NULL) 1558 err(EX_OSERR, "calloc"); 1559 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0) 1560 err(EX_OSERR, "getsockopt(IP_FW_GET)"); 1561 bcopy(&((struct ip_fw *)data)->next_rule, 1562 &set_disable, sizeof(set_disable)); 1563 1564 for (i = 0, msg = "disable" ; i < RESVD_SET; i++) 1565 if ((set_disable & (1<<i))) { 1566 printf("%s %d", msg, i); 1567 msg = ""; 1568 } 1569 msg = (set_disable) ? " enable" : "enable"; 1570 for (i = 0; i < RESVD_SET; i++) 1571 if (!(set_disable & (1<<i))) { 1572 printf("%s %d", msg, i); 1573 msg = ""; 1574 } 1575 printf("\n"); 1576 } else if (!strncmp(*av, "swap", strlen(*av))) { 1577 ac--; av++; 1578 if (ac != 2) 1579 errx(EX_USAGE, "set swap needs 2 set numbers\n"); 1580 rulenum = atoi(av[0]); 1581 new_set = atoi(av[1]); 1582 if (!isdigit(*(av[0])) || rulenum > RESVD_SET) 1583 errx(EX_DATAERR, "invalid set number %s\n", av[0]); 1584 if (!isdigit(*(av[1])) || new_set > RESVD_SET) 1585 errx(EX_DATAERR, "invalid set number %s\n", av[1]); 1586 masks[0] = (4 << 24) | (new_set << 16) | (rulenum); 1587 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1588 } else if (!strncmp(*av, "move", strlen(*av))) { 1589 ac--; av++; 1590 if (ac && !strncmp(*av, "rule", strlen(*av))) { 1591 cmd = 2; 1592 ac--; av++; 1593 } else 1594 cmd = 3; 1595 if (ac != 3 || strncmp(av[1], "to", strlen(*av))) 1596 errx(EX_USAGE, "syntax: set move [rule] X to Y\n"); 1597 rulenum = atoi(av[0]); 1598 new_set = atoi(av[2]); 1599 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) || 1600 (cmd == 2 && rulenum == 65535) ) 1601 errx(EX_DATAERR, "invalid source number %s\n", av[0]); 1602 if (!isdigit(*(av[2])) || new_set > RESVD_SET) 1603 errx(EX_DATAERR, "invalid dest. set %s\n", av[1]); 1604 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum); 1605 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t)); 1606 } else if (!strncmp(*av, "disable", strlen(*av)) || 1607 !strncmp(*av, "enable", strlen(*av)) ) { 1608 int which = !strncmp(*av, "enable", strlen(*av)) ? 1 : 0; 1609 1610 ac--; av++; 1611 masks[0] = masks[1] = 0; 1612 1613 while (ac) { 1614 if (isdigit(**av)) { 1615 i = atoi(*av); 1616 if (i < 0 || i > RESVD_SET) 1617 errx(EX_DATAERR, 1618 "invalid set number %d\n", i); 1619 masks[which] |= (1<<i); 1620 } else if (!strncmp(*av, "disable", strlen(*av))) 1621 which = 0; 1622 else if (!strncmp(*av, "enable", strlen(*av))) 1623 which = 1; 1624 else 1625 errx(EX_DATAERR, 1626 "invalid set command %s\n", *av); 1627 av++; ac--; 1628 } 1629 if ( (masks[0] & masks[1]) != 0 ) 1630 errx(EX_DATAERR, 1631 "cannot enable and disable the same set\n"); 1632 1633 i = do_cmd(IP_FW_DEL, masks, sizeof(masks)); 1634 if (i) 1635 warn("set enable/disable: setsockopt(IP_FW_DEL)"); 1636 } else 1637 errx(EX_USAGE, "invalid set command %s\n", *av); 1638 } 1639 1640 static void 1641 sysctl_handler(int ac, char *av[], int which) 1642 { 1643 ac--; 1644 av++; 1645 1646 if (ac == 0) { 1647 warnx("missing keyword to enable/disable\n"); 1648 } else if (strncmp(*av, "firewall", strlen(*av)) == 0) { 1649 sysctlbyname("net.inet.ip.fw.enable", NULL, 0, 1650 &which, sizeof(which)); 1651 } else if (strncmp(*av, "one_pass", strlen(*av)) == 0) { 1652 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0, 1653 &which, sizeof(which)); 1654 } else if (strncmp(*av, "debug", strlen(*av)) == 0) { 1655 sysctlbyname("net.inet.ip.fw.debug", NULL, 0, 1656 &which, sizeof(which)); 1657 } else if (strncmp(*av, "verbose", strlen(*av)) == 0) { 1658 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0, 1659 &which, sizeof(which)); 1660 } else if (strncmp(*av, "dyn_keepalive", strlen(*av)) == 0) { 1661 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0, 1662 &which, sizeof(which)); 1663 } else { 1664 warnx("unrecognize enable/disable keyword: %s\n", *av); 1665 } 1666 } 1667 1668 static void 1669 list(int ac, char *av[], int show_counters) 1670 { 1671 struct ip_fw *r; 1672 ipfw_dyn_rule *dynrules, *d; 1673 1674 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r))) 1675 char *lim; 1676 void *data = NULL; 1677 int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width; 1678 int exitval = EX_OK; 1679 int lac; 1680 char **lav; 1681 u_long rnum, last; 1682 char *endptr; 1683 int seen = 0; 1684 1685 const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET; 1686 int nalloc = 1024; /* start somewhere... */ 1687 1688 if (test_only) { 1689 fprintf(stderr, "Testing only, list disabled\n"); 1690 return; 1691 } 1692 1693 ac--; 1694 av++; 1695 1696 /* get rules or pipes from kernel, resizing array as necessary */ 1697 nbytes = nalloc; 1698 1699 while (nbytes >= nalloc) { 1700 nalloc = nalloc * 2 + 200; 1701 nbytes = nalloc; 1702 if ((data = realloc(data, nbytes)) == NULL) 1703 err(EX_OSERR, "realloc"); 1704 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0) 1705 err(EX_OSERR, "getsockopt(IP_%s_GET)", 1706 do_pipe ? "DUMMYNET" : "FW"); 1707 } 1708 1709 if (do_pipe) { 1710 list_pipes(data, nbytes, ac, av); 1711 goto done; 1712 } 1713 1714 /* 1715 * Count static rules. They have variable size so we 1716 * need to scan the list to count them. 1717 */ 1718 for (nstat = 1, r = data, lim = (char *)data + nbytes; 1719 r->rulenum < 65535 && (char *)r < lim; 1720 ++nstat, r = NEXT(r) ) 1721 ; /* nothing */ 1722 1723 /* 1724 * Count dynamic rules. This is easier as they have 1725 * fixed size. 1726 */ 1727 r = NEXT(r); 1728 dynrules = (ipfw_dyn_rule *)r ; 1729 n = (char *)r - (char *)data; 1730 ndyn = (nbytes - n) / sizeof *dynrules; 1731 1732 /* if showing stats, figure out column widths ahead of time */ 1733 bcwidth = pcwidth = 0; 1734 if (show_counters) { 1735 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) { 1736 /* packet counter */ 1737 width = snprintf(NULL, 0, "%llu", 1738 align_uint64(&r->pcnt)); 1739 if (width > pcwidth) 1740 pcwidth = width; 1741 1742 /* byte counter */ 1743 width = snprintf(NULL, 0, "%llu", 1744 align_uint64(&r->bcnt)); 1745 if (width > bcwidth) 1746 bcwidth = width; 1747 } 1748 } 1749 if (do_dynamic && ndyn) { 1750 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1751 width = snprintf(NULL, 0, "%llu", 1752 align_uint64(&d->pcnt)); 1753 if (width > pcwidth) 1754 pcwidth = width; 1755 1756 width = snprintf(NULL, 0, "%llu", 1757 align_uint64(&d->bcnt)); 1758 if (width > bcwidth) 1759 bcwidth = width; 1760 } 1761 } 1762 /* if no rule numbers were specified, list all rules */ 1763 if (ac == 0) { 1764 for (n = 0, r = data; n < nstat; n++, r = NEXT(r) ) 1765 show_ipfw(r, pcwidth, bcwidth); 1766 1767 if (do_dynamic && ndyn) { 1768 printf("## Dynamic rules (%d):\n", ndyn); 1769 for (n = 0, d = dynrules; n < ndyn; n++, d++) 1770 show_dyn_ipfw(d, pcwidth, bcwidth); 1771 } 1772 goto done; 1773 } 1774 1775 /* display specific rules requested on command line */ 1776 1777 for (lac = ac, lav = av; lac != 0; lac--) { 1778 /* convert command line rule # */ 1779 last = rnum = strtoul(*lav++, &endptr, 10); 1780 if (*endptr == '-') 1781 last = strtoul(endptr+1, &endptr, 10); 1782 if (*endptr) { 1783 exitval = EX_USAGE; 1784 warnx("invalid rule number: %s", *(lav - 1)); 1785 continue; 1786 } 1787 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) { 1788 if (r->rulenum > last) 1789 break; 1790 if (r->rulenum >= rnum && r->rulenum <= last) { 1791 show_ipfw(r, pcwidth, bcwidth); 1792 seen = 1; 1793 } 1794 } 1795 if (!seen) { 1796 /* give precedence to other error(s) */ 1797 if (exitval == EX_OK) 1798 exitval = EX_UNAVAILABLE; 1799 warnx("rule %lu does not exist", rnum); 1800 } 1801 } 1802 1803 if (do_dynamic && ndyn) { 1804 printf("## Dynamic rules:\n"); 1805 for (lac = ac, lav = av; lac != 0; lac--) { 1806 rnum = strtoul(*lav++, &endptr, 10); 1807 if (*endptr == '-') 1808 last = strtoul(endptr+1, &endptr, 10); 1809 if (*endptr) 1810 /* already warned */ 1811 continue; 1812 for (n = 0, d = dynrules; n < ndyn; n++, d++) { 1813 uint16_t rulenum; 1814 1815 bcopy(&d->rule, &rulenum, sizeof(rulenum)); 1816 if (rulenum > rnum) 1817 break; 1818 if (r->rulenum >= rnum && r->rulenum <= last) 1819 show_dyn_ipfw(d, pcwidth, bcwidth); 1820 } 1821 } 1822 } 1823 1824 ac = 0; 1825 1826 done: 1827 free(data); 1828 1829 if (exitval != EX_OK) 1830 exit(exitval); 1831 #undef NEXT 1832 } 1833 1834 static void 1835 show_usage(void) 1836 { 1837 fprintf(stderr, "usage: ipfw [options]\n" 1838 "do \"ipfw -h\" or see ipfw manpage for details\n" 1839 ); 1840 exit(EX_USAGE); 1841 } 1842 1843 static void 1844 help(void) 1845 { 1846 fprintf(stderr, 1847 "ipfw syntax summary (but please do read the ipfw(8) manpage):\n" 1848 "ipfw [-acdeftTnNpqS] <command> where <command> is one of:\n" 1849 "add [num] [set N] [prob x] RULE-BODY\n" 1850 "{pipe|queue} N config PIPE-BODY\n" 1851 "[pipe|queue] {zero|delete|show} [N{,N}]\n" 1852 "set [disable N... enable N...] | move [rule] X to Y | swap X Y | show\n" 1853 "\n" 1854 "RULE-BODY: check-state [LOG] | ACTION [LOG] ADDR [OPTION_LIST]\n" 1855 "ACTION: check-state | allow | count | deny | reject | skipto N |\n" 1856 " {divert|tee} PORT | forward ADDR | pipe N | queue N\n" 1857 "ADDR: [ MAC dst src ether_type ] \n" 1858 " [ from IPADDR [ PORT ] to IPADDR [ PORTLIST ] ]\n" 1859 "IPADDR: [not] { any | me | ip/bits{x,y,z} | IPLIST }\n" 1860 "IPLIST: { ip | ip/bits | ip:mask }[,IPLIST]\n" 1861 "OPTION_LIST: OPTION [OPTION_LIST]\n" 1862 "OPTION: bridged | {dst-ip|src-ip} ADDR | {dst-port|src-port} LIST |\n" 1863 " estab | frag | {gid|uid} N | icmptypes LIST | in | out | ipid LIST |\n" 1864 " iplen LIST | ipoptions SPEC | ipprecedence | ipsec | iptos SPEC |\n" 1865 " ipttl LIST | ipversion VER | keep-state | layer2 | limit ... |\n" 1866 " mac ... | mac-type LIST | proto LIST | {recv|xmit|via} {IF|IPADDR} |\n" 1867 " setup | {tcpack|tcpseq|tcpwin} NN | tcpflags SPEC | tcpoptions SPEC |\n" 1868 " verrevpath\n" 1869 ); 1870 exit(0); 1871 } 1872 1873 1874 static int 1875 lookup_host (char *host, struct in_addr *ipaddr) 1876 { 1877 struct hostent *he; 1878 1879 if (!inet_aton(host, ipaddr)) { 1880 if ((he = gethostbyname(host)) == NULL) 1881 return(-1); 1882 *ipaddr = *(struct in_addr *)he->h_addr_list[0]; 1883 } 1884 return(0); 1885 } 1886 1887 /* 1888 * fills the addr and mask fields in the instruction as appropriate from av. 1889 * Update length as appropriate. 1890 * The following formats are allowed: 1891 * any matches any IP. Actually returns an empty instruction. 1892 * me returns O_IP_*_ME 1893 * 1.2.3.4 single IP address 1894 * 1.2.3.4:5.6.7.8 address:mask 1895 * 1.2.3.4/24 address/mask 1896 * 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet 1897 * We can have multiple comma-separated address/mask entries. 1898 */ 1899 static void 1900 fill_ip(ipfw_insn_ip *cmd, char *av) 1901 { 1902 int len = 0; 1903 uint32_t *d = ((ipfw_insn_u32 *)cmd)->d; 1904 1905 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 1906 1907 if (!strncmp(av, "any", strlen(av))) 1908 return; 1909 1910 if (!strncmp(av, "me", strlen(av))) { 1911 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 1912 return; 1913 } 1914 1915 while (av) { 1916 /* 1917 * After the address we can have '/' or ':' indicating a mask, 1918 * ',' indicating another address follows, '{' indicating a 1919 * set of addresses of unspecified size. 1920 */ 1921 char *p = strpbrk(av, "/:,{"); 1922 int masklen; 1923 char md; 1924 1925 if (p) { 1926 md = *p; 1927 *p++ = '\0'; 1928 } else 1929 md = '\0'; 1930 1931 if (lookup_host(av, (struct in_addr *)&d[0]) != 0) 1932 errx(EX_NOHOST, "hostname ``%s'' unknown", av); 1933 switch (md) { 1934 case ':': 1935 if (!inet_aton(p, (struct in_addr *)&d[1])) 1936 errx(EX_DATAERR, "bad netmask ``%s''", p); 1937 break; 1938 case '/': 1939 masklen = atoi(p); 1940 if (masklen == 0) 1941 d[1] = htonl(0); /* mask */ 1942 else if (masklen > 32) 1943 errx(EX_DATAERR, "bad width ``%s''", p); 1944 else 1945 d[1] = htonl(~0 << (32 - masklen)); 1946 break; 1947 case '{': /* no mask, assume /24 and put back the '{' */ 1948 d[1] = htonl(~0 << (32 - 24)); 1949 *(--p) = md; 1950 break; 1951 1952 case ',': /* single address plus continuation */ 1953 *(--p) = md; 1954 /* FALLTHROUGH */ 1955 case 0: /* initialization value */ 1956 default: 1957 d[1] = htonl(~0); /* force /32 */ 1958 break; 1959 } 1960 d[0] &= d[1]; /* mask base address with mask */ 1961 /* find next separator */ 1962 if (p) 1963 p = strpbrk(p, ",{"); 1964 if (p && *p == '{') { 1965 /* 1966 * We have a set of addresses. They are stored as follows: 1967 * arg1 is the set size (powers of 2, 2..256) 1968 * addr is the base address IN HOST FORMAT 1969 * mask.. is an array of arg1 bits (rounded up to 1970 * the next multiple of 32) with bits set 1971 * for each host in the map. 1972 */ 1973 uint32_t *map = (uint32_t *)&cmd->mask; 1974 int low, high; 1975 int i = contigmask((uint8_t *)&(d[1]), 32); 1976 1977 if (len > 0) 1978 errx(EX_DATAERR, "address set cannot be in a list"); 1979 if (i < 24 || i > 31) 1980 errx(EX_DATAERR, "invalid set with mask %d\n", i); 1981 cmd->o.arg1 = 1<<(32-i); /* map length */ 1982 d[0] = ntohl(d[0]); /* base addr in host format */ 1983 cmd->o.opcode = O_IP_DST_SET; /* default */ 1984 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32; 1985 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++) 1986 map[i] = 0; /* clear map */ 1987 1988 av = p + 1; 1989 low = d[0] & 0xff; 1990 high = low + cmd->o.arg1 - 1; 1991 /* 1992 * Here, i stores the previous value when we specify a range 1993 * of addresses within a mask, e.g. 45-63. i = -1 means we 1994 * have no previous value. 1995 */ 1996 i = -1; /* previous value in a range */ 1997 while (isdigit(*av)) { 1998 char *s; 1999 int a = strtol(av, &s, 0); 2000 2001 if (s == av) { /* no parameter */ 2002 if (*av != '}') 2003 errx(EX_DATAERR, "set not closed\n"); 2004 if (i != -1) 2005 errx(EX_DATAERR, "incomplete range %d-", i); 2006 break; 2007 } 2008 if (a < low || a > high) 2009 errx(EX_DATAERR, "addr %d out of range [%d-%d]\n", 2010 a, low, high); 2011 a -= low; 2012 if (i == -1) /* no previous in range */ 2013 i = a; 2014 else { /* check that range is valid */ 2015 if (i > a) 2016 errx(EX_DATAERR, "invalid range %d-%d", 2017 i+low, a+low); 2018 if (*s == '-') 2019 errx(EX_DATAERR, "double '-' in range"); 2020 } 2021 for (; i <= a; i++) 2022 map[i/32] |= 1<<(i & 31); 2023 i = -1; 2024 if (*s == '-') 2025 i = a; 2026 else if (*s == '}') 2027 break; 2028 av = s+1; 2029 } 2030 return; 2031 } 2032 av = p; 2033 if (av) /* then *av must be a ',' */ 2034 av++; 2035 2036 /* Check this entry */ 2037 if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */ 2038 /* 2039 * 'any' turns the entire list into a NOP. 2040 * 'not any' never matches, so it is removed from the 2041 * list unless it is the only item, in which case we 2042 * report an error. 2043 */ 2044 if (cmd->o.len & F_NOT) { /* "not any" never matches */ 2045 if (av == NULL && len == 0) /* only this entry */ 2046 errx(EX_DATAERR, "not any never matches"); 2047 } 2048 /* else do nothing and skip this entry */ 2049 continue; 2050 } 2051 /* A single IP can be stored in an optimized format */ 2052 if (d[1] == IP_MASK_ALL && av == NULL && len == 0) { 2053 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 2054 return; 2055 } 2056 len += 2; /* two words... */ 2057 d += 2; 2058 } /* end while */ 2059 cmd->o.len |= len+1; 2060 } 2061 2062 2063 /* 2064 * helper function to process a set of flags and set bits in the 2065 * appropriate masks. 2066 */ 2067 static void 2068 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode, 2069 struct _s_x *flags, char *p) 2070 { 2071 uint8_t set=0, clear=0; 2072 2073 while (p && *p) { 2074 char *q; /* points to the separator */ 2075 int val; 2076 uint8_t *which; /* mask we are working on */ 2077 2078 if (*p == '!') { 2079 p++; 2080 which = &clear; 2081 } else 2082 which = &set; 2083 q = strchr(p, ','); 2084 if (q) 2085 *q++ = '\0'; 2086 val = match_token(flags, p); 2087 if (val <= 0) 2088 errx(EX_DATAERR, "invalid flag %s", p); 2089 *which |= (uint8_t)val; 2090 p = q; 2091 } 2092 cmd->opcode = opcode; 2093 cmd->len = (cmd->len & (F_NOT | F_OR)) | 1; 2094 cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8); 2095 } 2096 2097 2098 static void 2099 delete(int ac, char *av[]) 2100 { 2101 uint32_t rulenum; 2102 struct dn_pipe p; 2103 int i; 2104 int exitval = EX_OK; 2105 int do_set = 0; 2106 2107 memset(&p, 0, sizeof p); 2108 2109 av++; ac--; 2110 if (ac > 0 && !strncmp(*av, "set", strlen(*av))) { 2111 do_set = 1; /* delete set */ 2112 ac--; av++; 2113 } 2114 2115 /* Rule number */ 2116 while (ac && isdigit(**av)) { 2117 i = atoi(*av); av++; ac--; 2118 if (do_pipe) { 2119 if (do_pipe == 1) 2120 p.pipe_nr = i; 2121 else 2122 p.fs.fs_nr = i; 2123 i = do_cmd(IP_DUMMYNET_DEL, &p, sizeof p); 2124 if (i) { 2125 exitval = 1; 2126 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", 2127 do_pipe == 1 ? p.pipe_nr : p.fs.fs_nr); 2128 } 2129 } else { 2130 rulenum = (i & 0xffff) | (do_set << 24); 2131 i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum); 2132 if (i) { 2133 exitval = EX_UNAVAILABLE; 2134 warn("rule %u: setsockopt(IP_FW_DEL)", 2135 rulenum); 2136 } 2137 } 2138 } 2139 if (exitval != EX_OK) 2140 exit(exitval); 2141 } 2142 2143 2144 /* 2145 * fill the interface structure. We do not check the name as we can 2146 * create interfaces dynamically, so checking them at insert time 2147 * makes relatively little sense. 2148 * A '*' following the name means any unit. 2149 */ 2150 static void 2151 fill_iface(ipfw_insn_if *cmd, char *arg) 2152 { 2153 cmd->name[0] = '\0'; 2154 cmd->o.len |= F_INSN_SIZE(ipfw_insn_if); 2155 2156 /* Parse the interface or address */ 2157 if (!strcmp(arg, "any")) 2158 cmd->o.len = 0; /* effectively ignore this command */ 2159 else if (!isdigit(*arg)) { 2160 char *q; 2161 2162 strncpy(cmd->name, arg, sizeof(cmd->name)); 2163 cmd->name[sizeof(cmd->name) - 1] = '\0'; 2164 /* find first digit or wildcard */ 2165 for (q = cmd->name; *q && !isdigit(*q) && *q != '*'; q++) 2166 continue; 2167 cmd->p.unit = (*q == '*') ? -1 : atoi(q); 2168 *q = '\0'; 2169 } else if (!inet_aton(arg, &cmd->p.ip)) 2170 errx(EX_DATAERR, "bad ip address ``%s''", arg); 2171 } 2172 2173 /* 2174 * the following macro returns an error message if we run out of 2175 * arguments. 2176 */ 2177 #define NEED1(msg) {if (!ac) errx(EX_USAGE, msg);} 2178 2179 static void 2180 config_pipe(int ac, char **av) 2181 { 2182 struct dn_pipe p; 2183 int i; 2184 char *end; 2185 uint32_t a; 2186 void *par = NULL; 2187 2188 memset(&p, 0, sizeof p); 2189 2190 av++; ac--; 2191 /* Pipe number */ 2192 if (ac && isdigit(**av)) { 2193 i = atoi(*av); av++; ac--; 2194 if (do_pipe == 1) 2195 p.pipe_nr = i; 2196 else 2197 p.fs.fs_nr = i; 2198 } 2199 while (ac > 0) { 2200 double d; 2201 int tok = match_token(dummynet_params, *av); 2202 ac--; av++; 2203 2204 switch(tok) { 2205 case TOK_NOERROR: 2206 p.fs.flags_fs |= DN_NOERROR; 2207 break; 2208 2209 case TOK_PLR: 2210 NEED1("plr needs argument 0..1\n"); 2211 d = strtod(av[0], NULL); 2212 if (d > 1) 2213 d = 1; 2214 else if (d < 0) 2215 d = 0; 2216 p.fs.plr = (int)(d*0x7fffffff); 2217 ac--; av++; 2218 break; 2219 2220 case TOK_QUEUE: 2221 NEED1("queue needs queue size\n"); 2222 end = NULL; 2223 p.fs.qsize = strtoul(av[0], &end, 0); 2224 if (*end == 'K' || *end == 'k') { 2225 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 2226 p.fs.qsize *= 1024; 2227 } else if (*end == 'B' || !strncmp(end, "by", 2)) { 2228 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 2229 } 2230 ac--; av++; 2231 break; 2232 2233 case TOK_BUCKETS: 2234 NEED1("buckets needs argument\n"); 2235 p.fs.rq_size = strtoul(av[0], NULL, 0); 2236 ac--; av++; 2237 break; 2238 2239 case TOK_MASK: 2240 NEED1("mask needs mask specifier\n"); 2241 /* 2242 * per-flow queue, mask is dst_ip, dst_port, 2243 * src_ip, src_port, proto measured in bits 2244 */ 2245 par = NULL; 2246 2247 p.fs.flow_mask.dst_ip = 0; 2248 p.fs.flow_mask.src_ip = 0; 2249 p.fs.flow_mask.dst_port = 0; 2250 p.fs.flow_mask.src_port = 0; 2251 p.fs.flow_mask.proto = 0; 2252 end = NULL; 2253 2254 while (ac >= 1) { 2255 uint32_t *p32 = NULL; 2256 uint16_t *p16 = NULL; 2257 2258 tok = match_token(dummynet_params, *av); 2259 ac--; av++; 2260 switch(tok) { 2261 case TOK_ALL: 2262 /* 2263 * special case, all bits significant 2264 */ 2265 p.fs.flow_mask.dst_ip = ~0; 2266 p.fs.flow_mask.src_ip = ~0; 2267 p.fs.flow_mask.dst_port = ~0; 2268 p.fs.flow_mask.src_port = ~0; 2269 p.fs.flow_mask.proto = ~0; 2270 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2271 goto end_mask; 2272 2273 case TOK_DSTIP: 2274 p32 = &p.fs.flow_mask.dst_ip; 2275 break; 2276 2277 case TOK_SRCIP: 2278 p32 = &p.fs.flow_mask.src_ip; 2279 break; 2280 2281 case TOK_DSTPORT: 2282 p16 = &p.fs.flow_mask.dst_port; 2283 break; 2284 2285 case TOK_SRCPORT: 2286 p16 = &p.fs.flow_mask.src_port; 2287 break; 2288 2289 case TOK_PROTO: 2290 break; 2291 2292 default: 2293 ac++; av--; /* backtrack */ 2294 goto end_mask; 2295 } 2296 if (ac < 1) 2297 errx(EX_USAGE, "mask: value missing"); 2298 if (*av[0] == '/') { 2299 a = strtoul(av[0]+1, &end, 0); 2300 a = (a == 32) ? ~0 : (1 << a) - 1; 2301 } else 2302 a = strtoul(av[0], &end, 0); 2303 if (p32 != NULL) 2304 *p32 = a; 2305 else if (p16 != NULL) { 2306 if (a > 65535) 2307 errx(EX_DATAERR, 2308 "mask: must be 16 bit"); 2309 *p16 = (uint16_t)a; 2310 } else { 2311 if (a > 255) 2312 errx(EX_DATAERR, 2313 "mask: must be 8 bit"); 2314 p.fs.flow_mask.proto = (uint8_t)a; 2315 } 2316 if (a != 0) 2317 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 2318 ac--; av++; 2319 } /* end while, config masks */ 2320 end_mask: 2321 break; 2322 2323 case TOK_RED: 2324 case TOK_GRED: 2325 NEED1("red/gred needs w_q/min_th/max_th/max_p\n"); 2326 p.fs.flags_fs |= DN_IS_RED; 2327 if (tok == TOK_GRED) 2328 p.fs.flags_fs |= DN_IS_GENTLE_RED; 2329 /* 2330 * the format for parameters is w_q/min_th/max_th/max_p 2331 */ 2332 if ((end = strsep(&av[0], "/"))) { 2333 double w_q = strtod(end, NULL); 2334 if (w_q > 1 || w_q <= 0) 2335 errx(EX_DATAERR, "0 < w_q <= 1"); 2336 p.fs.w_q = (int) (w_q * (1 << SCALE_RED)); 2337 } 2338 if ((end = strsep(&av[0], "/"))) { 2339 p.fs.min_th = strtoul(end, &end, 0); 2340 if (*end == 'K' || *end == 'k') 2341 p.fs.min_th *= 1024; 2342 } 2343 if ((end = strsep(&av[0], "/"))) { 2344 p.fs.max_th = strtoul(end, &end, 0); 2345 if (*end == 'K' || *end == 'k') 2346 p.fs.max_th *= 1024; 2347 } 2348 if ((end = strsep(&av[0], "/"))) { 2349 double max_p = strtod(end, NULL); 2350 if (max_p > 1 || max_p <= 0) 2351 errx(EX_DATAERR, "0 < max_p <= 1"); 2352 p.fs.max_p = (int)(max_p * (1 << SCALE_RED)); 2353 } 2354 ac--; av++; 2355 break; 2356 2357 case TOK_DROPTAIL: 2358 p.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED); 2359 break; 2360 2361 case TOK_BW: 2362 NEED1("bw needs bandwidth or interface\n"); 2363 if (do_pipe != 1) 2364 errx(EX_DATAERR, "bandwidth only valid for pipes"); 2365 /* 2366 * set clocking interface or bandwidth value 2367 */ 2368 if (av[0][0] >= 'a' && av[0][0] <= 'z') { 2369 int l = sizeof(p.if_name)-1; 2370 /* interface name */ 2371 strncpy(p.if_name, av[0], l); 2372 p.if_name[l] = '\0'; 2373 p.bandwidth = 0; 2374 } else { 2375 p.if_name[0] = '\0'; 2376 p.bandwidth = strtoul(av[0], &end, 0); 2377 if (*end == 'K' || *end == 'k') { 2378 end++; 2379 p.bandwidth *= 1000; 2380 } else if (*end == 'M') { 2381 end++; 2382 p.bandwidth *= 1000000; 2383 } 2384 if (*end == 'B' || !strncmp(end, "by", 2)) 2385 p.bandwidth *= 8; 2386 if (p.bandwidth < 0) 2387 errx(EX_DATAERR, "bandwidth too large"); 2388 } 2389 ac--; av++; 2390 break; 2391 2392 case TOK_DELAY: 2393 if (do_pipe != 1) 2394 errx(EX_DATAERR, "delay only valid for pipes"); 2395 NEED1("delay needs argument 0..10000ms\n"); 2396 p.delay = strtoul(av[0], NULL, 0); 2397 ac--; av++; 2398 break; 2399 2400 case TOK_WEIGHT: 2401 if (do_pipe == 1) 2402 errx(EX_DATAERR,"weight only valid for queues"); 2403 NEED1("weight needs argument 0..100\n"); 2404 p.fs.weight = strtoul(av[0], &end, 0); 2405 ac--; av++; 2406 break; 2407 2408 case TOK_PIPE: 2409 if (do_pipe == 1) 2410 errx(EX_DATAERR,"pipe only valid for queues"); 2411 NEED1("pipe needs pipe_number\n"); 2412 p.fs.parent_nr = strtoul(av[0], &end, 0); 2413 ac--; av++; 2414 break; 2415 2416 default: 2417 errx(EX_DATAERR, "unrecognised option ``%s''", *av); 2418 } 2419 } 2420 if (do_pipe == 1) { 2421 if (p.pipe_nr == 0) 2422 errx(EX_DATAERR, "pipe_nr must be > 0"); 2423 if (p.delay > 10000) 2424 errx(EX_DATAERR, "delay must be < 10000"); 2425 } else { /* do_pipe == 2, queue */ 2426 if (p.fs.parent_nr == 0) 2427 errx(EX_DATAERR, "pipe must be > 0"); 2428 if (p.fs.weight >100) 2429 errx(EX_DATAERR, "weight must be <= 100"); 2430 } 2431 if (p.fs.flags_fs & DN_QSIZE_IS_BYTES) { 2432 if (p.fs.qsize > 1024*1024) 2433 errx(EX_DATAERR, "queue size must be < 1MB"); 2434 } else { 2435 if (p.fs.qsize > 100) 2436 errx(EX_DATAERR, "2 <= queue size <= 100"); 2437 } 2438 if (p.fs.flags_fs & DN_IS_RED) { 2439 size_t len; 2440 int lookup_depth, avg_pkt_size; 2441 double s, idle, weight, w_q; 2442 struct clockinfo ck; 2443 int t; 2444 2445 if (p.fs.min_th >= p.fs.max_th) 2446 errx(EX_DATAERR, "min_th %d must be < than max_th %d", 2447 p.fs.min_th, p.fs.max_th); 2448 if (p.fs.max_th == 0) 2449 errx(EX_DATAERR, "max_th must be > 0"); 2450 2451 len = sizeof(int); 2452 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth", 2453 &lookup_depth, &len, NULL, 0) == -1) 2454 2455 errx(1, "sysctlbyname(\"%s\")", 2456 "net.inet.ip.dummynet.red_lookup_depth"); 2457 if (lookup_depth == 0) 2458 errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth" 2459 " must be greater than zero"); 2460 2461 len = sizeof(int); 2462 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size", 2463 &avg_pkt_size, &len, NULL, 0) == -1) 2464 2465 errx(1, "sysctlbyname(\"%s\")", 2466 "net.inet.ip.dummynet.red_avg_pkt_size"); 2467 if (avg_pkt_size == 0) 2468 errx(EX_DATAERR, 2469 "net.inet.ip.dummynet.red_avg_pkt_size must" 2470 " be greater than zero"); 2471 2472 len = sizeof(struct clockinfo); 2473 if (sysctlbyname("kern.clockrate", &ck, &len, NULL, 0) == -1) 2474 errx(1, "sysctlbyname(\"%s\")", "kern.clockrate"); 2475 2476 /* 2477 * Ticks needed for sending a medium-sized packet. 2478 * Unfortunately, when we are configuring a WF2Q+ queue, we 2479 * do not have bandwidth information, because that is stored 2480 * in the parent pipe, and also we have multiple queues 2481 * competing for it. So we set s=0, which is not very 2482 * correct. But on the other hand, why do we want RED with 2483 * WF2Q+ ? 2484 */ 2485 if (p.bandwidth==0) /* this is a WF2Q+ queue */ 2486 s = 0; 2487 else 2488 s = ck.hz * avg_pkt_size * 8 / p.bandwidth; 2489 2490 /* 2491 * max idle time (in ticks) before avg queue size becomes 0. 2492 * NOTA: (3/w_q) is approx the value x so that 2493 * (1-w_q)^x < 10^-3. 2494 */ 2495 w_q = ((double)p.fs.w_q) / (1 << SCALE_RED); 2496 idle = s * 3. / w_q; 2497 p.fs.lookup_step = (int)idle / lookup_depth; 2498 if (!p.fs.lookup_step) 2499 p.fs.lookup_step = 1; 2500 weight = 1 - w_q; 2501 for (t = p.fs.lookup_step; t > 0; --t) 2502 weight *= weight; 2503 p.fs.lookup_weight = (int)(weight * (1 << SCALE_RED)); 2504 } 2505 i = do_cmd(IP_DUMMYNET_CONFIGURE, &p, sizeof p); 2506 if (i) 2507 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE"); 2508 } 2509 2510 static void 2511 get_mac_addr_mask(char *p, uint8_t *addr, uint8_t *mask) 2512 { 2513 int i, l; 2514 2515 for (i=0; i<6; i++) 2516 addr[i] = mask[i] = 0; 2517 if (!strcmp(p, "any")) 2518 return; 2519 2520 for (i=0; *p && i<6;i++, p++) { 2521 addr[i] = strtol(p, &p, 16); 2522 if (*p != ':') /* we start with the mask */ 2523 break; 2524 } 2525 if (*p == '/') { /* mask len */ 2526 l = strtol(p+1, &p, 0); 2527 for (i=0; l>0; l -=8, i++) 2528 mask[i] = (l >=8) ? 0xff : (~0) << (8-l); 2529 } else if (*p == '&') { /* mask */ 2530 for (i=0, p++; *p && i<6;i++, p++) { 2531 mask[i] = strtol(p, &p, 16); 2532 if (*p != ':') 2533 break; 2534 } 2535 } else if (*p == '\0') { 2536 for (i=0; i<6; i++) 2537 mask[i] = 0xff; 2538 } 2539 for (i=0; i<6; i++) 2540 addr[i] &= mask[i]; 2541 } 2542 2543 /* 2544 * helper function, updates the pointer to cmd with the length 2545 * of the current command, and also cleans up the first word of 2546 * the new command in case it has been clobbered before. 2547 */ 2548 static ipfw_insn * 2549 next_cmd(ipfw_insn *cmd) 2550 { 2551 cmd += F_LEN(cmd); 2552 bzero(cmd, sizeof(*cmd)); 2553 return cmd; 2554 } 2555 2556 /* 2557 * Takes arguments and copies them into a comment 2558 */ 2559 static void 2560 fill_comment(ipfw_insn *cmd, int ac, char **av) 2561 { 2562 int i, l; 2563 char *p = (char *)(cmd + 1); 2564 2565 cmd->opcode = O_NOP; 2566 cmd->len = (cmd->len & (F_NOT | F_OR)); 2567 2568 /* Compute length of comment string. */ 2569 for (i = 0, l = 0; i < ac; i++) 2570 l += strlen(av[i]) + 1; 2571 if (l == 0) 2572 return; 2573 if (l > 84) 2574 errx(EX_DATAERR, 2575 "comment too long (max 80 chars)"); 2576 l = 1 + (l+3)/4; 2577 cmd->len = (cmd->len & (F_NOT | F_OR)) | l; 2578 for (i = 0; i < ac; i++) { 2579 strcpy(p, av[i]); 2580 p += strlen(av[i]); 2581 *p++ = ' '; 2582 } 2583 *(--p) = '\0'; 2584 } 2585 2586 /* 2587 * A function to fill simple commands of size 1. 2588 * Existing flags are preserved. 2589 */ 2590 static void 2591 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg) 2592 { 2593 cmd->opcode = opcode; 2594 cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1; 2595 cmd->arg1 = arg; 2596 } 2597 2598 /* 2599 * Fetch and add the MAC address and type, with masks. This generates one or 2600 * two microinstructions, and returns the pointer to the last one. 2601 */ 2602 static ipfw_insn * 2603 add_mac(ipfw_insn *cmd, int ac, char *av[]) 2604 { 2605 ipfw_insn_mac *mac; 2606 2607 if (ac < 2) 2608 errx(EX_DATAERR, "MAC dst src"); 2609 2610 cmd->opcode = O_MACADDR2; 2611 cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac); 2612 2613 mac = (ipfw_insn_mac *)cmd; 2614 get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */ 2615 get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */ 2616 return cmd; 2617 } 2618 2619 static ipfw_insn * 2620 add_mactype(ipfw_insn *cmd, int ac, char *av) 2621 { 2622 if (ac < 1) 2623 errx(EX_DATAERR, "missing MAC type"); 2624 if (strcmp(av, "any") != 0) { /* we have a non-null type */ 2625 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE); 2626 cmd->opcode = O_MAC_TYPE; 2627 return cmd; 2628 } else 2629 return NULL; 2630 } 2631 2632 static ipfw_insn * 2633 add_proto(ipfw_insn *cmd, char *av) 2634 { 2635 struct protoent *pe; 2636 u_char proto = 0; 2637 2638 if (!strncmp(av, "all", strlen(av))) 2639 ; /* same as "ip" */ 2640 else if ((proto = atoi(av)) > 0) 2641 ; /* all done! */ 2642 else if ((pe = getprotobyname(av)) != NULL) 2643 proto = pe->p_proto; 2644 else 2645 return NULL; 2646 if (proto != IPPROTO_IP) 2647 fill_cmd(cmd, O_PROTO, 0, proto); 2648 return cmd; 2649 } 2650 2651 static ipfw_insn * 2652 add_srcip(ipfw_insn *cmd, char *av) 2653 { 2654 fill_ip((ipfw_insn_ip *)cmd, av); 2655 if (cmd->opcode == O_IP_DST_SET) /* set */ 2656 cmd->opcode = O_IP_SRC_SET; 2657 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2658 cmd->opcode = O_IP_SRC_ME; 2659 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2660 cmd->opcode = O_IP_SRC; 2661 else /* addr/mask */ 2662 cmd->opcode = O_IP_SRC_MASK; 2663 return cmd; 2664 } 2665 2666 static ipfw_insn * 2667 add_dstip(ipfw_insn *cmd, char *av) 2668 { 2669 fill_ip((ipfw_insn_ip *)cmd, av); 2670 if (cmd->opcode == O_IP_DST_SET) /* set */ 2671 ; 2672 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */ 2673 cmd->opcode = O_IP_DST_ME; 2674 else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */ 2675 cmd->opcode = O_IP_DST; 2676 else /* addr/mask */ 2677 cmd->opcode = O_IP_DST_MASK; 2678 return cmd; 2679 } 2680 2681 static ipfw_insn * 2682 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode) 2683 { 2684 if (!strncmp(av, "any", strlen(av))) { 2685 return NULL; 2686 } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) { 2687 /* XXX todo: check that we have a protocol with ports */ 2688 cmd->opcode = opcode; 2689 return cmd; 2690 } 2691 return NULL; 2692 } 2693 2694 /* 2695 * Parse arguments and assemble the microinstructions which make up a rule. 2696 * Rules are added into the 'rulebuf' and then copied in the correct order 2697 * into the actual rule. 2698 * 2699 * The syntax for a rule starts with the action, followed by an 2700 * optional log action, and the various match patterns. 2701 * In the assembled microcode, the first opcode must be an O_PROBE_STATE 2702 * (generated if the rule includes a keep-state option), then the 2703 * various match patterns, the "log" action, and the actual action. 2704 * 2705 */ 2706 static void 2707 add(int ac, char *av[]) 2708 { 2709 /* 2710 * rules are added into the 'rulebuf' and then copied in 2711 * the correct order into the actual rule. 2712 * Some things that need to go out of order (prob, action etc.) 2713 * go into actbuf[]. 2714 */ 2715 static uint32_t rulebuf[255], actbuf[255], cmdbuf[255]; 2716 2717 ipfw_insn *src, *dst, *cmd, *action, *prev=NULL; 2718 ipfw_insn *first_cmd; /* first match pattern */ 2719 2720 struct ip_fw *rule; 2721 2722 /* 2723 * various flags used to record that we entered some fields. 2724 */ 2725 ipfw_insn *have_state = NULL; /* check-state or keep-state */ 2726 2727 int i; 2728 2729 int open_par = 0; /* open parenthesis ( */ 2730 2731 /* proto is here because it is used to fetch ports */ 2732 u_char proto = IPPROTO_IP; /* default protocol */ 2733 2734 double match_prob = 1; /* match probability, default is always match */ 2735 2736 bzero(actbuf, sizeof(actbuf)); /* actions go here */ 2737 bzero(cmdbuf, sizeof(cmdbuf)); 2738 bzero(rulebuf, sizeof(rulebuf)); 2739 2740 rule = (struct ip_fw *)rulebuf; 2741 cmd = (ipfw_insn *)cmdbuf; 2742 action = (ipfw_insn *)actbuf; 2743 2744 av++; ac--; 2745 2746 /* [rule N] -- Rule number optional */ 2747 if (ac && isdigit(**av)) { 2748 rule->rulenum = atoi(*av); 2749 av++; 2750 ac--; 2751 } 2752 2753 /* [set N] -- set number (0..RESVD_SET), optional */ 2754 if (ac > 1 && !strncmp(*av, "set", strlen(*av))) { 2755 int set = strtoul(av[1], NULL, 10); 2756 if (set < 0 || set > RESVD_SET) 2757 errx(EX_DATAERR, "illegal set %s", av[1]); 2758 rule->set = set; 2759 av += 2; ac -= 2; 2760 } 2761 2762 /* [prob D] -- match probability, optional */ 2763 if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) { 2764 match_prob = strtod(av[1], NULL); 2765 2766 if (match_prob <= 0 || match_prob > 1) 2767 errx(EX_DATAERR, "illegal match prob. %s", av[1]); 2768 av += 2; ac -= 2; 2769 } 2770 2771 /* action -- mandatory */ 2772 NEED1("missing action"); 2773 i = match_token(rule_actions, *av); 2774 ac--; av++; 2775 action->len = 1; /* default */ 2776 switch(i) { 2777 case TOK_CHECKSTATE: 2778 have_state = action; 2779 action->opcode = O_CHECK_STATE; 2780 break; 2781 2782 case TOK_ACCEPT: 2783 action->opcode = O_ACCEPT; 2784 break; 2785 2786 case TOK_DENY: 2787 action->opcode = O_DENY; 2788 action->arg1 = 0; 2789 break; 2790 2791 case TOK_REJECT: 2792 action->opcode = O_REJECT; 2793 action->arg1 = ICMP_UNREACH_HOST; 2794 break; 2795 2796 case TOK_RESET: 2797 action->opcode = O_REJECT; 2798 action->arg1 = ICMP_REJECT_RST; 2799 break; 2800 2801 case TOK_UNREACH: 2802 action->opcode = O_REJECT; 2803 NEED1("missing reject code"); 2804 fill_reject_code(&action->arg1, *av); 2805 ac--; av++; 2806 break; 2807 2808 case TOK_COUNT: 2809 action->opcode = O_COUNT; 2810 break; 2811 2812 case TOK_QUEUE: 2813 case TOK_PIPE: 2814 action->len = F_INSN_SIZE(ipfw_insn_pipe); 2815 case TOK_SKIPTO: 2816 if (i == TOK_QUEUE) 2817 action->opcode = O_QUEUE; 2818 else if (i == TOK_PIPE) 2819 action->opcode = O_PIPE; 2820 else if (i == TOK_SKIPTO) 2821 action->opcode = O_SKIPTO; 2822 NEED1("missing skipto/pipe/queue number"); 2823 action->arg1 = strtoul(*av, NULL, 10); 2824 av++; ac--; 2825 break; 2826 2827 case TOK_DIVERT: 2828 case TOK_TEE: 2829 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE; 2830 NEED1("missing divert/tee port"); 2831 action->arg1 = strtoul(*av, NULL, 0); 2832 if (action->arg1 == 0) { 2833 struct servent *s; 2834 setservent(1); 2835 s = getservbyname(av[0], "divert"); 2836 if (s != NULL) 2837 action->arg1 = ntohs(s->s_port); 2838 else 2839 errx(EX_DATAERR, "illegal divert/tee port"); 2840 } 2841 ac--; av++; 2842 break; 2843 2844 case TOK_FORWARD: { 2845 ipfw_insn_sa *p = (ipfw_insn_sa *)action; 2846 char *s, *end; 2847 2848 NEED1("missing forward address[:port]"); 2849 2850 action->opcode = O_FORWARD_IP; 2851 action->len = F_INSN_SIZE(ipfw_insn_sa); 2852 2853 p->sa.sin_len = sizeof(struct sockaddr_in); 2854 p->sa.sin_family = AF_INET; 2855 p->sa.sin_port = 0; 2856 /* 2857 * locate the address-port separator (':' or ',') 2858 */ 2859 s = strchr(*av, ':'); 2860 if (s == NULL) 2861 s = strchr(*av, ','); 2862 if (s != NULL) { 2863 *(s++) = '\0'; 2864 i = strtoport(s, &end, 0 /* base */, 0 /* proto */); 2865 if (s == end) 2866 errx(EX_DATAERR, 2867 "illegal forwarding port ``%s''", s); 2868 p->sa.sin_port = (u_short)i; 2869 } 2870 lookup_host(*av, &(p->sa.sin_addr)); 2871 } 2872 ac--; av++; 2873 break; 2874 2875 case TOK_COMMENT: 2876 /* pretend it is a 'count' rule followed by the comment */ 2877 action->opcode = O_COUNT; 2878 ac++; av--; /* go back... */ 2879 break; 2880 2881 default: 2882 errx(EX_DATAERR, "invalid action %s\n", av[-1]); 2883 } 2884 action = next_cmd(action); 2885 2886 /* 2887 * [log [logamount N]] -- log, optional 2888 * 2889 * If exists, it goes first in the cmdbuf, but then it is 2890 * skipped in the copy section to the end of the buffer. 2891 */ 2892 if (ac && !strncmp(*av, "log", strlen(*av))) { 2893 ipfw_insn_log *c = (ipfw_insn_log *)cmd; 2894 int l; 2895 2896 cmd->len = F_INSN_SIZE(ipfw_insn_log); 2897 cmd->opcode = O_LOG; 2898 av++; ac--; 2899 if (ac && !strncmp(*av, "logamount", strlen(*av))) { 2900 ac--; av++; 2901 NEED1("logamount requires argument"); 2902 l = atoi(*av); 2903 if (l < 0) 2904 errx(EX_DATAERR, "logamount must be positive"); 2905 c->max_log = l; 2906 ac--; av++; 2907 } 2908 cmd = next_cmd(cmd); 2909 } 2910 2911 if (have_state) /* must be a check-state, we are done */ 2912 goto done; 2913 2914 #define OR_START(target) \ 2915 if (ac && (*av[0] == '(' || *av[0] == '{')) { \ 2916 if (open_par) \ 2917 errx(EX_USAGE, "nested \"(\" not allowed\n"); \ 2918 prev = NULL; \ 2919 open_par = 1; \ 2920 if ( (av[0])[1] == '\0') { \ 2921 ac--; av++; \ 2922 } else \ 2923 (*av)++; \ 2924 } \ 2925 target: \ 2926 2927 2928 #define CLOSE_PAR \ 2929 if (open_par) { \ 2930 if (ac && ( \ 2931 !strncmp(*av, ")", strlen(*av)) || \ 2932 !strncmp(*av, "}", strlen(*av)) )) { \ 2933 prev = NULL; \ 2934 open_par = 0; \ 2935 ac--; av++; \ 2936 } else \ 2937 errx(EX_USAGE, "missing \")\"\n"); \ 2938 } 2939 2940 #define NOT_BLOCK \ 2941 if (ac && !strncmp(*av, "not", strlen(*av))) { \ 2942 if (cmd->len & F_NOT) \ 2943 errx(EX_USAGE, "double \"not\" not allowed\n"); \ 2944 cmd->len |= F_NOT; \ 2945 ac--; av++; \ 2946 } 2947 2948 #define OR_BLOCK(target) \ 2949 if (ac && !strncmp(*av, "or", strlen(*av))) { \ 2950 if (prev == NULL || open_par == 0) \ 2951 errx(EX_DATAERR, "invalid OR block"); \ 2952 prev->len |= F_OR; \ 2953 ac--; av++; \ 2954 goto target; \ 2955 } \ 2956 CLOSE_PAR; 2957 2958 first_cmd = cmd; 2959 2960 #if 0 2961 /* 2962 * MAC addresses, optional. 2963 * If we have this, we skip the part "proto from src to dst" 2964 * and jump straight to the option parsing. 2965 */ 2966 NOT_BLOCK; 2967 NEED1("missing protocol"); 2968 if (!strncmp(*av, "MAC", strlen(*av)) || 2969 !strncmp(*av, "mac", strlen(*av))) { 2970 ac--; av++; /* the "MAC" keyword */ 2971 add_mac(cmd, ac, av); /* exits in case of errors */ 2972 cmd = next_cmd(cmd); 2973 ac -= 2; av += 2; /* dst-mac and src-mac */ 2974 NOT_BLOCK; 2975 NEED1("missing mac type"); 2976 if (add_mactype(cmd, ac, av[0])) 2977 cmd = next_cmd(cmd); 2978 ac--; av++; /* any or mac-type */ 2979 goto read_options; 2980 } 2981 #endif 2982 2983 /* 2984 * protocol, mandatory 2985 */ 2986 OR_START(get_proto); 2987 NOT_BLOCK; 2988 NEED1("missing protocol"); 2989 if (add_proto(cmd, *av)) { 2990 av++; ac--; 2991 if (F_LEN(cmd) == 0) /* plain IP */ 2992 proto = 0; 2993 else { 2994 proto = cmd->arg1; 2995 prev = cmd; 2996 cmd = next_cmd(cmd); 2997 } 2998 } else if (first_cmd != cmd) { 2999 errx(EX_DATAERR, "invalid protocol ``%s''", *av); 3000 } else 3001 goto read_options; 3002 OR_BLOCK(get_proto); 3003 3004 /* 3005 * "from", mandatory 3006 */ 3007 if (!ac || strncmp(*av, "from", strlen(*av))) 3008 errx(EX_USAGE, "missing ``from''"); 3009 ac--; av++; 3010 3011 /* 3012 * source IP, mandatory 3013 */ 3014 OR_START(source_ip); 3015 NOT_BLOCK; /* optional "not" */ 3016 NEED1("missing source address"); 3017 if (add_srcip(cmd, *av)) { 3018 ac--; av++; 3019 if (F_LEN(cmd) != 0) { /* ! any */ 3020 prev = cmd; 3021 cmd = next_cmd(cmd); 3022 } 3023 } 3024 OR_BLOCK(source_ip); 3025 3026 /* 3027 * source ports, optional 3028 */ 3029 NOT_BLOCK; /* optional "not" */ 3030 if (ac) { 3031 if (!strncmp(*av, "any", strlen(*av)) || 3032 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3033 ac--; av++; 3034 if (F_LEN(cmd) != 0) 3035 cmd = next_cmd(cmd); 3036 } 3037 } 3038 3039 /* 3040 * "to", mandatory 3041 */ 3042 if (!ac || strncmp(*av, "to", strlen(*av))) 3043 errx(EX_USAGE, "missing ``to''"); 3044 av++; ac--; 3045 3046 /* 3047 * destination, mandatory 3048 */ 3049 OR_START(dest_ip); 3050 NOT_BLOCK; /* optional "not" */ 3051 NEED1("missing dst address"); 3052 if (add_dstip(cmd, *av)) { 3053 ac--; av++; 3054 if (F_LEN(cmd) != 0) { /* ! any */ 3055 prev = cmd; 3056 cmd = next_cmd(cmd); 3057 } 3058 } 3059 OR_BLOCK(dest_ip); 3060 3061 /* 3062 * dest. ports, optional 3063 */ 3064 NOT_BLOCK; /* optional "not" */ 3065 if (ac) { 3066 if (!strncmp(*av, "any", strlen(*av)) || 3067 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3068 ac--; av++; 3069 if (F_LEN(cmd) != 0) 3070 cmd = next_cmd(cmd); 3071 } 3072 } 3073 3074 read_options: 3075 if (ac && first_cmd == cmd) { 3076 /* 3077 * nothing specified so far, store in the rule to ease 3078 * printout later. 3079 */ 3080 rule->_pad = 1; 3081 } 3082 prev = NULL; 3083 while (ac) { 3084 char *s; 3085 ipfw_insn_u32 *cmd32; /* alias for cmd */ 3086 3087 s = *av; 3088 cmd32 = (ipfw_insn_u32 *)cmd; 3089 3090 if (*s == '!') { /* alternate syntax for NOT */ 3091 if (cmd->len & F_NOT) 3092 errx(EX_USAGE, "double \"not\" not allowed\n"); 3093 cmd->len = F_NOT; 3094 s++; 3095 } 3096 i = match_token(rule_options, s); 3097 ac--; av++; 3098 switch(i) { 3099 case TOK_NOT: 3100 if (cmd->len & F_NOT) 3101 errx(EX_USAGE, "double \"not\" not allowed\n"); 3102 cmd->len = F_NOT; 3103 break; 3104 3105 case TOK_OR: 3106 if (open_par == 0 || prev == NULL) 3107 errx(EX_USAGE, "invalid \"or\" block\n"); 3108 prev->len |= F_OR; 3109 break; 3110 3111 case TOK_STARTBRACE: 3112 if (open_par) 3113 errx(EX_USAGE, "+nested \"(\" not allowed\n"); 3114 open_par = 1; 3115 break; 3116 3117 case TOK_ENDBRACE: 3118 if (!open_par) 3119 errx(EX_USAGE, "+missing \")\"\n"); 3120 open_par = 0; 3121 prev = NULL; 3122 break; 3123 3124 case TOK_IN: 3125 fill_cmd(cmd, O_IN, 0, 0); 3126 break; 3127 3128 case TOK_OUT: 3129 cmd->len ^= F_NOT; /* toggle F_NOT */ 3130 fill_cmd(cmd, O_IN, 0, 0); 3131 break; 3132 3133 case TOK_FRAG: 3134 fill_cmd(cmd, O_FRAG, 0, 0); 3135 break; 3136 3137 case TOK_LAYER2: 3138 fill_cmd(cmd, O_LAYER2, 0, 0); 3139 break; 3140 3141 case TOK_XMIT: 3142 case TOK_RECV: 3143 case TOK_VIA: 3144 NEED1("recv, xmit, via require interface name" 3145 " or address"); 3146 fill_iface((ipfw_insn_if *)cmd, av[0]); 3147 ac--; av++; 3148 if (F_LEN(cmd) == 0) /* not a valid address */ 3149 break; 3150 if (i == TOK_XMIT) 3151 cmd->opcode = O_XMIT; 3152 else if (i == TOK_RECV) 3153 cmd->opcode = O_RECV; 3154 else if (i == TOK_VIA) 3155 cmd->opcode = O_VIA; 3156 break; 3157 3158 case TOK_ICMPTYPES: 3159 NEED1("icmptypes requires list of types"); 3160 fill_icmptypes((ipfw_insn_u32 *)cmd, *av); 3161 av++; ac--; 3162 break; 3163 3164 case TOK_IPTTL: 3165 NEED1("ipttl requires TTL"); 3166 if (strpbrk(*av, "-,")) { 3167 if (!add_ports(cmd, *av, 0, O_IPTTL)) 3168 errx(EX_DATAERR, "invalid ipttl %s", *av); 3169 } else 3170 fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0)); 3171 ac--; av++; 3172 break; 3173 3174 case TOK_IPID: 3175 NEED1("ipid requires id"); 3176 if (strpbrk(*av, "-,")) { 3177 if (!add_ports(cmd, *av, 0, O_IPID)) 3178 errx(EX_DATAERR, "invalid ipid %s", *av); 3179 } else 3180 fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0)); 3181 ac--; av++; 3182 break; 3183 3184 case TOK_IPLEN: 3185 NEED1("iplen requires length"); 3186 if (strpbrk(*av, "-,")) { 3187 if (!add_ports(cmd, *av, 0, O_IPLEN)) 3188 errx(EX_DATAERR, "invalid ip len %s", *av); 3189 } else 3190 fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0)); 3191 ac--; av++; 3192 break; 3193 3194 case TOK_IPVER: 3195 NEED1("ipver requires version"); 3196 fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0)); 3197 ac--; av++; 3198 break; 3199 3200 case TOK_IPPRECEDENCE: 3201 NEED1("ipprecedence requires value"); 3202 fill_cmd(cmd, O_IPPRECEDENCE, 0, 3203 (strtoul(*av, NULL, 0) & 7) << 5); 3204 ac--; av++; 3205 break; 3206 3207 case TOK_IPOPTS: 3208 NEED1("missing argument for ipoptions"); 3209 fill_flags(cmd, O_IPOPT, f_ipopts, *av); 3210 ac--; av++; 3211 break; 3212 3213 case TOK_IPTOS: 3214 NEED1("missing argument for iptos"); 3215 fill_flags(cmd, O_IPTOS, f_iptos, *av); 3216 ac--; av++; 3217 break; 3218 3219 case TOK_UID: 3220 NEED1("uid requires argument"); 3221 { 3222 char *end; 3223 uid_t uid; 3224 struct passwd *pwd; 3225 3226 cmd->opcode = O_UID; 3227 uid = strtoul(*av, &end, 0); 3228 pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av); 3229 if (pwd == NULL) 3230 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av); 3231 cmd32->d[0] = pwd->pw_uid; 3232 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3233 ac--; av++; 3234 } 3235 break; 3236 3237 case TOK_GID: 3238 NEED1("gid requires argument"); 3239 { 3240 char *end; 3241 gid_t gid; 3242 struct group *grp; 3243 3244 cmd->opcode = O_GID; 3245 gid = strtoul(*av, &end, 0); 3246 grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av); 3247 if (grp == NULL) 3248 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av); 3249 cmd32->d[0] = grp->gr_gid; 3250 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3251 ac--; av++; 3252 } 3253 break; 3254 3255 case TOK_ESTAB: 3256 fill_cmd(cmd, O_ESTAB, 0, 0); 3257 break; 3258 3259 case TOK_SETUP: 3260 fill_cmd(cmd, O_TCPFLAGS, 0, 3261 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 ); 3262 break; 3263 3264 case TOK_TCPOPTS: 3265 NEED1("missing argument for tcpoptions"); 3266 fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av); 3267 ac--; av++; 3268 break; 3269 3270 case TOK_TCPSEQ: 3271 case TOK_TCPACK: 3272 NEED1("tcpseq/tcpack requires argument"); 3273 cmd->len = F_INSN_SIZE(ipfw_insn_u32); 3274 cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK; 3275 cmd32->d[0] = htonl(strtoul(*av, NULL, 0)); 3276 ac--; av++; 3277 break; 3278 3279 case TOK_TCPWIN: 3280 NEED1("tcpwin requires length"); 3281 fill_cmd(cmd, O_TCPWIN, 0, 3282 htons(strtoul(*av, NULL, 0))); 3283 ac--; av++; 3284 break; 3285 3286 case TOK_TCPFLAGS: 3287 NEED1("missing argument for tcpflags"); 3288 cmd->opcode = O_TCPFLAGS; 3289 fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av); 3290 ac--; av++; 3291 break; 3292 3293 case TOK_KEEPSTATE: 3294 if (open_par) 3295 errx(EX_USAGE, "keep-state cannot be part " 3296 "of an or block"); 3297 if (have_state) 3298 errx(EX_USAGE, "only one of keep-state " 3299 "and limit is allowed"); 3300 have_state = cmd; 3301 fill_cmd(cmd, O_KEEP_STATE, 0, 0); 3302 break; 3303 3304 case TOK_LIMIT: 3305 if (open_par) 3306 errx(EX_USAGE, "limit cannot be part " 3307 "of an or block"); 3308 if (have_state) 3309 errx(EX_USAGE, "only one of keep-state " 3310 "and limit is allowed"); 3311 NEED1("limit needs mask and # of connections"); 3312 have_state = cmd; 3313 { 3314 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd; 3315 3316 cmd->len = F_INSN_SIZE(ipfw_insn_limit); 3317 cmd->opcode = O_LIMIT; 3318 c->limit_mask = 0; 3319 c->conn_limit = 0; 3320 for (; ac >1 ;) { 3321 int val; 3322 3323 val = match_token(limit_masks, *av); 3324 if (val <= 0) 3325 break; 3326 c->limit_mask |= val; 3327 ac--; av++; 3328 } 3329 c->conn_limit = atoi(*av); 3330 if (c->conn_limit == 0) 3331 errx(EX_USAGE, "limit: limit must be >0"); 3332 if (c->limit_mask == 0) 3333 errx(EX_USAGE, "missing limit mask"); 3334 ac--; av++; 3335 } 3336 break; 3337 3338 case TOK_PROTO: 3339 NEED1("missing protocol"); 3340 if (add_proto(cmd, *av)) { 3341 proto = cmd->arg1; 3342 ac--; av++; 3343 } else 3344 errx(EX_DATAERR, "invalid protocol ``%s''", 3345 *av); 3346 break; 3347 3348 case TOK_SRCIP: 3349 NEED1("missing source IP"); 3350 if (add_srcip(cmd, *av)) { 3351 ac--; av++; 3352 } 3353 break; 3354 3355 case TOK_DSTIP: 3356 NEED1("missing destination IP"); 3357 if (add_dstip(cmd, *av)) { 3358 ac--; av++; 3359 } 3360 break; 3361 3362 case TOK_SRCPORT: 3363 NEED1("missing source port"); 3364 if (!strncmp(*av, "any", strlen(*av)) || 3365 add_ports(cmd, *av, proto, O_IP_SRCPORT)) { 3366 ac--; av++; 3367 } else 3368 errx(EX_DATAERR, "invalid source port %s", *av); 3369 break; 3370 3371 case TOK_DSTPORT: 3372 NEED1("missing destination port"); 3373 if (!strncmp(*av, "any", strlen(*av)) || 3374 add_ports(cmd, *av, proto, O_IP_DSTPORT)) { 3375 ac--; av++; 3376 } else 3377 errx(EX_DATAERR, "invalid destination port %s", 3378 *av); 3379 break; 3380 3381 case TOK_MAC: 3382 if (ac < 2) 3383 errx(EX_USAGE, "MAC dst-mac src-mac"); 3384 if (add_mac(cmd, ac, av)) { 3385 ac -= 2; av += 2; 3386 } 3387 break; 3388 3389 case TOK_MACTYPE: 3390 NEED1("missing mac type"); 3391 if (!add_mactype(cmd, ac, *av)) 3392 errx(EX_DATAERR, "invalid mac type %s", *av); 3393 ac--; av++; 3394 break; 3395 3396 case TOK_VERREVPATH: 3397 fill_cmd(cmd, O_VERREVPATH, 0, 0); 3398 break; 3399 3400 case TOK_IPSEC: 3401 fill_cmd(cmd, O_IPSEC, 0, 0); 3402 break; 3403 3404 case TOK_COMMENT: 3405 fill_comment(cmd, ac, av); 3406 av += ac; 3407 ac = 0; 3408 break; 3409 3410 default: 3411 errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s); 3412 } 3413 if (F_LEN(cmd) > 0) { /* prepare to advance */ 3414 prev = cmd; 3415 cmd = next_cmd(cmd); 3416 } 3417 } 3418 3419 done: 3420 /* 3421 * Now copy stuff into the rule. 3422 * If we have a keep-state option, the first instruction 3423 * must be a PROBE_STATE (which is generated here). 3424 * If we have a LOG option, it was stored as the first command, 3425 * and now must be moved to the top of the action part. 3426 */ 3427 dst = (ipfw_insn *)rule->cmd; 3428 3429 /* 3430 * First thing to write into the command stream is the match probability. 3431 */ 3432 if (match_prob != 1) { /* 1 means always match */ 3433 dst->opcode = O_PROB; 3434 dst->len = 2; 3435 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff); 3436 dst += dst->len; 3437 } 3438 3439 /* 3440 * generate O_PROBE_STATE if necessary 3441 */ 3442 if (have_state && have_state->opcode != O_CHECK_STATE) { 3443 fill_cmd(dst, O_PROBE_STATE, 0, 0); 3444 dst = next_cmd(dst); 3445 } 3446 /* 3447 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT 3448 */ 3449 for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) { 3450 i = F_LEN(src); 3451 3452 switch (src->opcode) { 3453 case O_LOG: 3454 case O_KEEP_STATE: 3455 case O_LIMIT: 3456 break; 3457 default: 3458 bcopy(src, dst, i * sizeof(uint32_t)); 3459 dst += i; 3460 } 3461 } 3462 3463 /* 3464 * put back the have_state command as last opcode 3465 */ 3466 if (have_state && have_state->opcode != O_CHECK_STATE) { 3467 i = F_LEN(have_state); 3468 bcopy(have_state, dst, i * sizeof(uint32_t)); 3469 dst += i; 3470 } 3471 /* 3472 * start action section 3473 */ 3474 rule->act_ofs = dst - rule->cmd; 3475 3476 /* 3477 * put back O_LOG if necessary 3478 */ 3479 src = (ipfw_insn *)cmdbuf; 3480 if (src->opcode == O_LOG) { 3481 i = F_LEN(src); 3482 bcopy(src, dst, i * sizeof(uint32_t)); 3483 dst += i; 3484 } 3485 /* 3486 * copy all other actions 3487 */ 3488 for (src = (ipfw_insn *)actbuf; src != action; src += i) { 3489 i = F_LEN(src); 3490 bcopy(src, dst, i * sizeof(uint32_t)); 3491 dst += i; 3492 } 3493 3494 rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd); 3495 i = (char *)dst - (char *)rule; 3496 if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1) 3497 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD"); 3498 if (!do_quiet) 3499 show_ipfw(rule, 0, 0); 3500 } 3501 3502 static void 3503 zero(int ac, char *av[], int optname /* IP_FW_ZERO or IP_FW_RESETLOG */) 3504 { 3505 int rulenum; 3506 int failed = EX_OK; 3507 char const *name = optname == IP_FW_ZERO ? "ZERO" : "RESETLOG"; 3508 3509 av++; ac--; 3510 3511 if (!ac) { 3512 /* clear all entries */ 3513 if (do_cmd(optname, NULL, 0) < 0) 3514 err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name); 3515 if (!do_quiet) 3516 printf("%s.\n", optname == IP_FW_ZERO ? 3517 "Accounting cleared":"Logging counts reset"); 3518 3519 return; 3520 } 3521 3522 while (ac) { 3523 /* Rule number */ 3524 if (isdigit(**av)) { 3525 rulenum = atoi(*av); 3526 av++; 3527 ac--; 3528 if (do_cmd(optname, &rulenum, sizeof rulenum)) { 3529 warn("rule %u: setsockopt(IP_FW_%s)", 3530 rulenum, name); 3531 failed = EX_UNAVAILABLE; 3532 } else if (!do_quiet) 3533 printf("Entry %d %s.\n", rulenum, 3534 optname == IP_FW_ZERO ? 3535 "cleared" : "logging count reset"); 3536 } else { 3537 errx(EX_USAGE, "invalid rule number ``%s''", *av); 3538 } 3539 } 3540 if (failed != EX_OK) 3541 exit(failed); 3542 } 3543 3544 static void 3545 flush(int force) 3546 { 3547 int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH; 3548 3549 if (!force && !do_quiet) { /* need to ask user */ 3550 int c; 3551 3552 printf("Are you sure? [yn] "); 3553 fflush(stdout); 3554 do { 3555 c = toupper(getc(stdin)); 3556 while (c != '\n' && getc(stdin) != '\n') 3557 if (feof(stdin)) 3558 return; /* and do not flush */ 3559 } while (c != 'Y' && c != 'N'); 3560 printf("\n"); 3561 if (c == 'N') /* user said no */ 3562 return; 3563 } 3564 if (do_cmd(cmd, NULL, 0) < 0) 3565 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)", 3566 do_pipe ? "DUMMYNET" : "FW"); 3567 if (!do_quiet) 3568 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules"); 3569 } 3570 3571 /* 3572 * Free a the (locally allocated) copy of command line arguments. 3573 */ 3574 static void 3575 free_args(int ac, char **av) 3576 { 3577 int i; 3578 3579 for (i=0; i < ac; i++) 3580 free(av[i]); 3581 free(av); 3582 } 3583 3584 /* 3585 * Called with the arguments (excluding program name). 3586 * Returns 0 if successful, 1 if empty command, errx() in case of errors. 3587 */ 3588 static int 3589 ipfw_main(int oldac, char **oldav) 3590 { 3591 int ch, ac, save_ac; 3592 char **av, **save_av; 3593 int do_acct = 0; /* Show packet/byte count */ 3594 int do_force = 0; /* Don't ask for confirmation */ 3595 3596 #define WHITESP " \t\f\v\n\r" 3597 if (oldac == 0) 3598 return 1; 3599 else if (oldac == 1) { 3600 /* 3601 * If we are called with a single string, try to split it into 3602 * arguments for subsequent parsing. 3603 * But first, remove spaces after a ',', by copying the string 3604 * in-place. 3605 */ 3606 char *arg = oldav[0]; /* The string... */ 3607 int l = strlen(arg); 3608 int copy = 0; /* 1 if we need to copy, 0 otherwise */ 3609 int i, j; 3610 for (i = j = 0; i < l; i++) { 3611 if (arg[i] == '#') /* comment marker */ 3612 break; 3613 if (copy) { 3614 arg[j++] = arg[i]; 3615 copy = !index("," WHITESP, arg[i]); 3616 } else { 3617 copy = !index(WHITESP, arg[i]); 3618 if (copy) 3619 arg[j++] = arg[i]; 3620 } 3621 } 3622 if (!copy && j > 0) /* last char was a 'blank', remove it */ 3623 j--; 3624 l = j; /* the new argument length */ 3625 arg[j++] = '\0'; 3626 if (l == 0) /* empty string! */ 3627 return 1; 3628 3629 /* 3630 * First, count number of arguments. Because of the previous 3631 * processing, this is just the number of blanks plus 1. 3632 */ 3633 for (i = 0, ac = 1; i < l; i++) 3634 if (index(WHITESP, arg[i]) != NULL) 3635 ac++; 3636 3637 av = calloc(ac, sizeof(char *)); 3638 3639 /* 3640 * Second, copy arguments from cmd[] to av[]. For each one, 3641 * j is the initial character, i is the one past the end. 3642 */ 3643 for (ac = 0, i = j = 0; i < l; i++) 3644 if (index(WHITESP, arg[i]) != NULL || i == l-1) { 3645 if (i == l-1) 3646 i++; 3647 av[ac] = calloc(i-j+1, 1); 3648 bcopy(arg+j, av[ac], i-j); 3649 ac++; 3650 j = i + 1; 3651 } 3652 } else { 3653 /* 3654 * If an argument ends with ',' join with the next one. 3655 */ 3656 int first, i, l; 3657 3658 av = calloc(oldac, sizeof(char *)); 3659 for (first = i = ac = 0, l = 0; i < oldac; i++) { 3660 char *arg = oldav[i]; 3661 int k = strlen(arg); 3662 3663 l += k; 3664 if (arg[k-1] != ',' || i == oldac-1) { 3665 /* Time to copy. */ 3666 av[ac] = calloc(l+1, 1); 3667 for (l=0; first <= i; first++) { 3668 strcat(av[ac]+l, oldav[first]); 3669 l += strlen(oldav[first]); 3670 } 3671 ac++; 3672 l = 0; 3673 first = i+1; 3674 } 3675 } 3676 } 3677 3678 /* Set the force flag for non-interactive processes */ 3679 do_force = !isatty(STDIN_FILENO); 3680 3681 /* Save arguments for final freeing of memory. */ 3682 save_ac = ac; 3683 save_av = av; 3684 3685 optind = optreset = 0; 3686 while ((ch = getopt(ac, av, "acdefhnNqs:STtv")) != -1) 3687 switch (ch) { 3688 case 'a': 3689 do_acct = 1; 3690 break; 3691 3692 case 'c': 3693 do_compact = 1; 3694 break; 3695 3696 case 'd': 3697 do_dynamic = 1; 3698 break; 3699 3700 case 'e': 3701 do_expired = 1; 3702 break; 3703 3704 case 'f': 3705 do_force = 1; 3706 break; 3707 3708 case 'h': /* help */ 3709 free_args(save_ac, save_av); 3710 help(); 3711 break; /* NOTREACHED */ 3712 3713 case 'n': 3714 test_only = 1; 3715 break; 3716 3717 case 'N': 3718 do_resolv = 1; 3719 break; 3720 3721 case 'q': 3722 do_quiet = 1; 3723 break; 3724 3725 case 's': /* sort */ 3726 do_sort = atoi(optarg); 3727 break; 3728 3729 case 'S': 3730 show_sets = 1; 3731 break; 3732 3733 case 't': 3734 do_time = 1; 3735 break; 3736 3737 case 'T': 3738 do_time = 2; /* numeric timestamp */ 3739 break; 3740 3741 case 'v': /* verbose */ 3742 verbose = 1; 3743 break; 3744 3745 default: 3746 free_args(save_ac, save_av); 3747 return 1; 3748 } 3749 3750 ac -= optind; 3751 av += optind; 3752 NEED1("bad arguments, for usage summary ``ipfw''"); 3753 3754 /* 3755 * An undocumented behaviour of ipfw1 was to allow rule numbers first, 3756 * e.g. "100 add allow ..." instead of "add 100 allow ...". 3757 * In case, swap first and second argument to get the normal form. 3758 */ 3759 if (ac > 1 && isdigit(*av[0])) { 3760 char *p = av[0]; 3761 3762 av[0] = av[1]; 3763 av[1] = p; 3764 } 3765 3766 /* 3767 * optional: pipe or queue 3768 */ 3769 do_pipe = 0; 3770 if (!strncmp(*av, "pipe", strlen(*av))) 3771 do_pipe = 1; 3772 else if (!strncmp(*av, "queue", strlen(*av))) 3773 do_pipe = 2; 3774 if (do_pipe) { 3775 ac--; 3776 av++; 3777 } 3778 NEED1("missing command"); 3779 3780 /* 3781 * For pipes and queues we normally say 'pipe NN config' 3782 * but the code is easier to parse as 'pipe config NN' 3783 * so we swap the two arguments. 3784 */ 3785 if (do_pipe > 0 && ac > 1 && isdigit(*av[0])) { 3786 char *p = av[0]; 3787 3788 av[0] = av[1]; 3789 av[1] = p; 3790 } 3791 3792 if (!strncmp(*av, "add", strlen(*av))) 3793 add(ac, av); 3794 else if (do_pipe && !strncmp(*av, "config", strlen(*av))) 3795 config_pipe(ac, av); 3796 else if (!strncmp(*av, "delete", strlen(*av))) 3797 delete(ac, av); 3798 else if (!strncmp(*av, "flush", strlen(*av))) 3799 flush(do_force); 3800 else if (!strncmp(*av, "zero", strlen(*av))) 3801 zero(ac, av, IP_FW_ZERO); 3802 else if (!strncmp(*av, "resetlog", strlen(*av))) 3803 zero(ac, av, IP_FW_RESETLOG); 3804 else if (!strncmp(*av, "print", strlen(*av)) || 3805 !strncmp(*av, "list", strlen(*av))) 3806 list(ac, av, do_acct); 3807 else if (!strncmp(*av, "set", strlen(*av))) 3808 sets_handler(ac, av); 3809 else if (!strncmp(*av, "enable", strlen(*av))) 3810 sysctl_handler(ac, av, 1); 3811 else if (!strncmp(*av, "disable", strlen(*av))) 3812 sysctl_handler(ac, av, 0); 3813 else if (!strncmp(*av, "show", strlen(*av))) 3814 list(ac, av, 1 /* show counters */); 3815 else 3816 errx(EX_USAGE, "bad command `%s'", *av); 3817 3818 /* Free memory allocated in the argument parsing. */ 3819 free_args(save_ac, save_av); 3820 return 0; 3821 } 3822 3823 3824 static void 3825 ipfw_readfile(int ac, char *av[]) 3826 { 3827 #define MAX_ARGS 32 3828 char buf[BUFSIZ]; 3829 char *cmd = NULL, *filename = av[ac-1]; 3830 int c, lineno=0; 3831 FILE *f = NULL; 3832 pid_t preproc = 0; 3833 3834 filename = av[ac-1]; 3835 3836 while ((c = getopt(ac, av, "cNnp:qS")) != -1) { 3837 switch(c) { 3838 case 'c': 3839 do_compact = 1; 3840 break; 3841 3842 case 'N': 3843 do_resolv = 1; 3844 break; 3845 3846 case 'n': 3847 test_only = 1; 3848 break; 3849 3850 case 'p': 3851 cmd = optarg; 3852 /* 3853 * Skip previous args and delete last one, so we 3854 * pass all but the last argument to the preprocessor 3855 * via av[optind-1] 3856 */ 3857 av += optind - 1; 3858 ac -= optind - 1; 3859 av[ac-1] = NULL; 3860 fprintf(stderr, "command is %s\n", av[0]); 3861 break; 3862 3863 case 'q': 3864 do_quiet = 1; 3865 break; 3866 3867 case 'S': 3868 show_sets = 1; 3869 break; 3870 3871 default: 3872 errx(EX_USAGE, "bad arguments, for usage" 3873 " summary ``ipfw''"); 3874 } 3875 3876 if (cmd != NULL) 3877 break; 3878 } 3879 3880 if (cmd == NULL && ac != optind + 1) { 3881 fprintf(stderr, "ac %d, optind %d\n", ac, optind); 3882 errx(EX_USAGE, "extraneous filename arguments"); 3883 } 3884 3885 if ((f = fopen(filename, "r")) == NULL) 3886 err(EX_UNAVAILABLE, "fopen: %s", filename); 3887 3888 if (cmd != NULL) { /* pipe through preprocessor */ 3889 int pipedes[2]; 3890 3891 if (pipe(pipedes) == -1) 3892 err(EX_OSERR, "cannot create pipe"); 3893 3894 preproc = fork(); 3895 if (preproc == -1) 3896 err(EX_OSERR, "cannot fork"); 3897 3898 if (preproc == 0) { 3899 /* 3900 * Child, will run the preprocessor with the 3901 * file on stdin and the pipe on stdout. 3902 */ 3903 if (dup2(fileno(f), 0) == -1 3904 || dup2(pipedes[1], 1) == -1) 3905 err(EX_OSERR, "dup2()"); 3906 fclose(f); 3907 close(pipedes[1]); 3908 close(pipedes[0]); 3909 execvp(cmd, av); 3910 err(EX_OSERR, "execvp(%s) failed", cmd); 3911 } else { /* parent, will reopen f as the pipe */ 3912 fclose(f); 3913 close(pipedes[1]); 3914 if ((f = fdopen(pipedes[0], "r")) == NULL) { 3915 int savederrno = errno; 3916 3917 (void)kill(preproc, SIGTERM); 3918 errno = savederrno; 3919 err(EX_OSERR, "fdopen()"); 3920 } 3921 } 3922 } 3923 3924 while (fgets(buf, BUFSIZ, f)) { /* read commands */ 3925 char linename[10]; 3926 char *args[1]; 3927 3928 lineno++; 3929 sprintf(linename, "Line %d", lineno); 3930 setprogname(linename); /* XXX */ 3931 args[0] = buf; 3932 ipfw_main(1, args); 3933 } 3934 fclose(f); 3935 if (cmd != NULL) { 3936 int status; 3937 3938 if (waitpid(preproc, &status, 0) == -1) 3939 errx(EX_OSERR, "waitpid()"); 3940 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK) 3941 errx(EX_UNAVAILABLE, 3942 "preprocessor exited with status %d", 3943 WEXITSTATUS(status)); 3944 else if (WIFSIGNALED(status)) 3945 errx(EX_UNAVAILABLE, 3946 "preprocessor exited with signal %d", 3947 WTERMSIG(status)); 3948 } 3949 } 3950 3951 int 3952 main(int ac, char *av[]) 3953 { 3954 /* 3955 * If the last argument is an absolute pathname, interpret it 3956 * as a file to be preprocessed. 3957 */ 3958 3959 if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0) 3960 ipfw_readfile(ac, av); 3961 else { 3962 if (ipfw_main(ac-1, av+1)) 3963 show_usage(); 3964 } 3965 return EX_OK; 3966 } 3967